refactor: 移除 Python upstream 依赖，清理全部 legacy/Python 兼容层

- 移除 upstream_base_url 参数及 AETHER_GATEWAY_UPSTREAM 环境变量，gateway 不再需要指向 Python 宿主
- 删除所有 LEGACY_*/PYTHON_* 常量、路由组、header 定义及 sunset/phaseout 机制
- 将 legacy_gateway_bridge 重命名为 internal_gateway，executor 相关命名统一为 execution_runtime
- dev.sh 新增 Postgres/Redis 预检查，移除 upstream 相关启动参数和提示
- 新增 ai_public 路由处理器
- 全量适配 handler、test、state、control 等模块的命名和接口变更

apps/aether-gateway/src/video_tasks/helpers.rs

@@ -1,5 +1,3 @@
-use super::*;
-
 mod body;
 mod path;
 mod transport;

apps/aether-gateway/src/video_tasks/helpers/body.rs

@@ -1,4 +1,4 @@
-use super::*;
+use serde_json::{Map, Value};
 
 pub(crate) fn context_text(context: &Map<String, Value>, key: &str) -> Option<String> {
     context

apps/aether-gateway/src/video_tasks/helpers/path.rs

@@ -1,4 +1,11 @@
-use super::*;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use aether_data::repository::video_tasks::VideoTaskStatus as StoredVideoTaskStatus;
+use uuid::Uuid;
+
+use super::super::{
+    LocalVideoTaskRegistryMutation, LocalVideoTaskStatus, VideoTaskTruthSourceMode,
+};
 
 pub(crate) fn extract_openai_task_id_from_path(path: &str) -> Option<&str> {
     let suffix = path.strip_prefix("/v1/videos/")?;

apps/aether-gateway/src/video_tasks/helpers/transport.rs

@@ -1,4 +1,23 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use aether_contracts::ExecutionPlan;
+use aether_data::repository::video_tasks::{
+    StoredVideoTask, VideoTaskStatus as StoredVideoTaskStatus,
+};
+use serde_json::{Map, Value};
+
+use super::super::{
+    LocalVideoTaskFollowUpPlan, LocalVideoTaskPersistence, LocalVideoTaskStatus,
+    LocalVideoTaskTransport,
+};
+use crate::gateway::provider_transport::{
+    resolve_local_gemini_auth, resolve_local_standard_auth, resolve_transport_execution_timeouts,
+    supports_local_gemini_transport, supports_local_standard_transport,
+    GatewayProviderTransportSnapshot,
+};
+use crate::gateway::GatewayControlAuthContext;
+
+use super::{context_text, non_empty_owned};
 
 impl LocalVideoTaskTransport {
     pub(crate) fn from_plan(plan: &ExecutionPlan) -> Option<Self> {

apps/aether-gateway/src/video_tasks/seed.rs

@@ -1,5 +1,3 @@
-use super::*;
-
 mod gemini;
 mod openai;
 mod snapshot;

apps/aether-gateway/src/video_tasks/seed/gemini.rs

@@ -1,4 +1,15 @@
-use super::*;
+use aether_contracts::{ExecutionPlan, RequestBody};
+use aether_data::repository::video_tasks::UpsertVideoTask;
+use serde_json::{json, Map, Value};
+
+use crate::gateway::GatewayControlAuthContext;
+
+use super::super::{
+    build_video_follow_up_report_context, current_unix_timestamp_secs, gemini_metadata_video_url,
+    request_body_string, request_body_u32, resolve_follow_up_auth, GeminiVideoTaskSeed,
+    LocalVideoTaskFollowUpPlan, LocalVideoTaskSnapshot, LocalVideoTaskStatus,
+    DEFAULT_VIDEO_TASK_MAX_POLL_COUNT, DEFAULT_VIDEO_TASK_POLL_INTERVAL_SECONDS,
+};
 
 impl GeminiVideoTaskSeed {
     pub(crate) fn apply_provider_body(&mut self, provider_body: &Map<String, Value>) {

apps/aether-gateway/src/video_tasks/seed/openai.rs

@@ -1,5 +1,3 @@
-use super::*;
-
 mod client;
 mod follow_up;
 mod persist;

apps/aether-gateway/src/video_tasks/seed/openai/client.rs

@@ -1,4 +1,12 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use aether_contracts::{ExecutionPlan, RequestBody};
+use serde_json::{json, Value};
+
+use super::super::super::{
+    map_openai_task_status, parse_video_content_variant, LocalVideoTaskContentAction,
+    LocalVideoTaskStatus, OpenAiVideoTaskSeed,
+};
 
 impl OpenAiVideoTaskSeed {
     pub(crate) fn build_content_stream_action(

apps/aether-gateway/src/video_tasks/seed/openai/follow_up.rs

@@ -1,4 +1,12 @@
-use super::*;
+use aether_contracts::{ExecutionPlan, RequestBody};
+use serde_json::Value;
+
+use crate::gateway::GatewayControlAuthContext;
+
+use super::super::super::{
+    build_video_follow_up_report_context, resolve_follow_up_auth, LocalVideoTaskFollowUpPlan,
+    LocalVideoTaskStatus, OpenAiVideoTaskSeed,
+};
 
 impl OpenAiVideoTaskSeed {
     pub(crate) fn build_delete_follow_up_plan(

apps/aether-gateway/src/video_tasks/seed/openai/persist.rs

@@ -1,4 +1,11 @@
-use super::*;
+use aether_data::repository::video_tasks::UpsertVideoTask;
+use serde_json::json;
+
+use super::super::super::{
+    current_unix_timestamp_secs, request_body_string, request_body_u32, LocalVideoTaskSnapshot,
+    LocalVideoTaskStatus, OpenAiVideoTaskSeed, DEFAULT_VIDEO_TASK_MAX_POLL_COUNT,
+    DEFAULT_VIDEO_TASK_POLL_INTERVAL_SECONDS,
+};
 
 impl OpenAiVideoTaskSeed {
     pub(crate) fn to_upsert_record(&self) -> UpsertVideoTask {

apps/aether-gateway/src/video_tasks/seed/openai/provider.rs

@@ -1,4 +1,6 @@
-use super::*;
+use serde_json::{Map, Value};
+
+use super::super::super::{LocalVideoTaskStatus, OpenAiVideoTaskSeed};
 
 impl OpenAiVideoTaskSeed {
     pub(crate) fn apply_provider_body(&mut self, provider_body: &Map<String, Value>) {

apps/aether-gateway/src/video_tasks/seed/snapshot.rs

@@ -1,4 +1,13 @@
-use super::*;
+use aether_data::repository::video_tasks::{StoredVideoTask, UpsertVideoTask};
+use serde_json::{json, Map, Value};
+
+use crate::gateway::provider_transport::GatewayProviderTransportSnapshot;
+
+use super::super::{
+    local_status_from_stored, non_empty_owned, request_body_string, GeminiVideoTaskSeed,
+    LocalVideoTaskPersistence, LocalVideoTaskReadResponse, LocalVideoTaskSnapshot,
+    LocalVideoTaskStatus, LocalVideoTaskTransport, OpenAiVideoTaskSeed,
+};
 
 impl LocalVideoTaskSnapshot {
     pub(crate) fn to_upsert_record(&self) -> UpsertVideoTask {

apps/aether-gateway/src/video_tasks/seed/sync.rs

@@ -1,4 +1,14 @@
-use super::*;
+use aether_contracts::ExecutionPlan;
+use serde_json::{json, Map, Value};
+use uuid::Uuid;
+
+use super::super::{
+    context_text, context_u64, current_unix_timestamp_secs, generate_local_short_id,
+    request_body_text, GeminiVideoTaskSeed, LocalVideoTaskPersistence, LocalVideoTaskSeed,
+    LocalVideoTaskSnapshot, LocalVideoTaskStatus, LocalVideoTaskSuccessPlan,
+    LocalVideoTaskTransport, OpenAiVideoTaskSeed, VideoTaskSyncReportMode,
+    VideoTaskTruthSourceMode,
+};
 
 impl LocalVideoTaskSeed {
     pub(crate) fn from_sync_finalize(

apps/aether-gateway/src/video_tasks/service.rs

@@ -1,4 +1,8 @@
-use super::*;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use super::store::{FileVideoTaskStore, InMemoryVideoTaskStore, VideoTaskStore};
+use super::VideoTaskTruthSourceMode;
 
 mod follow_up;
 mod lifecycle;

apps/aether-gateway/src/video_tasks/service/follow_up.rs

@@ -1,4 +1,13 @@
-use super::*;
+use serde_json::Value;
+
+use super::super::{
+    extract_gemini_short_id_from_cancel_path, extract_openai_task_id_from_cancel_path,
+    extract_openai_task_id_from_path, extract_openai_task_id_from_remix_path,
+    LocalVideoTaskFollowUpPlan,
+};
+use crate::gateway::GatewayControlAuthContext;
+
+use super::VideoTaskService;
 
 impl VideoTaskService {
     pub(crate) fn prepare_follow_up_sync_plan(

apps/aether-gateway/src/video_tasks/service/lifecycle.rs

@@ -1,4 +1,11 @@
-use super::*;
+use aether_contracts::ExecutionPlan;
+use aether_data::repository::video_tasks::StoredVideoTask;
+use serde_json::{Map, Value};
+
+use super::super::{
+    resolve_local_video_registry_mutation, LocalVideoTaskSnapshot, LocalVideoTaskSuccessPlan,
+};
+use super::VideoTaskService;
 
 impl VideoTaskService {
     pub(crate) fn prepare_sync_success(

apps/aether-gateway/src/video_tasks/service/read.rs

@@ -1,4 +1,10 @@
-use super::*;
+use super::super::{
+    extract_gemini_short_id_from_path, extract_openai_task_id_from_content_path,
+    extract_openai_task_id_from_path, LocalVideoTaskContentAction, LocalVideoTaskReadResponse,
+    LocalVideoTaskSnapshot, VideoTaskTruthSourceMode,
+};
+
+use super::VideoTaskService;
 
 impl VideoTaskService {
     pub(crate) fn read_response(

apps/aether-gateway/src/video_tasks/service/refresh.rs

@@ -1,4 +1,13 @@
-use super::*;
+use aether_data::repository::video_tasks::StoredVideoTask;
+use serde_json::{Map, Value};
+
+use super::super::{
+    extract_gemini_short_id_from_path, extract_openai_task_id_from_path,
+    LocalVideoTaskProjectionTarget, LocalVideoTaskReadRefreshPlan, LocalVideoTaskSnapshot,
+    VideoTaskTruthSourceMode,
+};
+
+use super::VideoTaskService;
 
 impl VideoTaskService {
     pub(crate) fn snapshot_for_refresh_plan(

apps/aether-gateway/src/video_tasks/store.rs

@@ -1,4 +1,9 @@
-use super::*;
+use serde_json::{Map, Value};
+
+use super::{
+    GeminiVideoTaskSeed, LocalVideoTaskReadResponse, LocalVideoTaskRegistryMutation,
+    LocalVideoTaskSnapshot, OpenAiVideoTaskSeed,
+};
 
 mod backend;
 mod registry;

apps/aether-gateway/src/video_tasks/store/backend.rs

@@ -1,4 +1,14 @@
-use super::*;
+use std::path::{Path, PathBuf};
+use std::sync::Mutex;
+
+use serde_json::{Map, Value};
+
+use super::super::{
+    GeminiVideoTaskSeed, LocalVideoTaskReadResponse, LocalVideoTaskRegistryMutation,
+    LocalVideoTaskSnapshot, OpenAiVideoTaskSeed,
+};
+
+use super::{VideoTaskRegistry, VideoTaskStore};
 
 #[derive(Debug, Default)]
 pub(crate) struct InMemoryVideoTaskStore {

apps/aether-gateway/src/video_tasks/store/registry.rs

@@ -1,4 +1,12 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use serde::{Deserialize, Serialize};
+use serde_json::{Map, Value};
+
+use super::super::{
+    GeminiVideoTaskSeed, LocalVideoTaskReadResponse, LocalVideoTaskRegistryMutation,
+    LocalVideoTaskSnapshot, LocalVideoTaskStatus, OpenAiVideoTaskSeed,
+};
 
 #[derive(Debug, Clone, Default, Serialize, Deserialize)]
 pub(super) struct VideoTaskRegistry {

apps/aether-gateway/src/video_tasks/tests.rs

@@ -1,4 +1,15 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use aether_contracts::{ExecutionPlan, ExecutionTimeouts, ProxySnapshot, RequestBody};
+use serde_json::{json, Map, Value};
+use uuid::Uuid;
+
+use super::{
+    GatewayControlAuthContext, GeminiVideoTaskSeed, LocalVideoTaskContentAction,
+    LocalVideoTaskPersistence, LocalVideoTaskSeed, LocalVideoTaskSnapshot, LocalVideoTaskStatus,
+    LocalVideoTaskTransport, OpenAiVideoTaskSeed, VideoTaskService, VideoTaskSyncReportMode,
+    VideoTaskTruthSourceMode,
+};
 
 mod fixtures;
 mod plans;

apps/aether-gateway/src/video_tasks/tests/fixtures.rs

@@ -1,4 +1,11 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use serde_json::json;
+
+use super::{
+    ExecutionPlan, ExecutionTimeouts, GatewayControlAuthContext, LocalVideoTaskPersistence,
+    LocalVideoTaskTransport, ProxySnapshot, RequestBody,
+};
 
 pub(super) fn sample_transport(
     base_url: &str,

apps/aether-gateway/src/video_tasks/tests/plans.rs

@@ -1,5 +1,11 @@
 use super::fixtures::*;
-use super::*;
+use serde_json::{json, Value};
+use uuid::Uuid;
+
+use super::{
+    GeminiVideoTaskSeed, LocalVideoTaskSnapshot, LocalVideoTaskStatus, OpenAiVideoTaskSeed,
+    VideoTaskService, VideoTaskTruthSourceMode,
+};
 
 #[test]
 fn rust_authoritative_service_builds_openai_cancel_follow_up_plan() {

apps/aether-gateway/src/video_tasks/tests/projection.rs

@@ -1,5 +1,10 @@
 use super::fixtures::*;
-use super::*;
+use serde_json::{json, Value};
+
+use super::{
+    GeminiVideoTaskSeed, LocalVideoTaskContentAction, LocalVideoTaskSnapshot, LocalVideoTaskStatus,
+    OpenAiVideoTaskSeed, VideoTaskService, VideoTaskTruthSourceMode,
+};
 
 #[test]
 fn rust_authoritative_service_projects_openai_status_into_local_read_response() {

apps/aether-gateway/src/video_tasks/tests/sync.rs

@@ -1,5 +1,10 @@
 use super::fixtures::*;
-use super::*;
+use serde_json::{json, Map, Value};
+
+use super::{
+    GeminiVideoTaskSeed, LocalVideoTaskSeed, LocalVideoTaskSnapshot, LocalVideoTaskStatus,
+    OpenAiVideoTaskSeed, VideoTaskService, VideoTaskSyncReportMode, VideoTaskTruthSourceMode,
+};
 
 #[test]
 fn openai_video_seed_preserves_existing_local_identity() {

apps/aether-gateway/src/video_tasks/types.rs

@@ -1,4 +1,8 @@
-use super::*;
+use std::collections::BTreeMap;
+
+use aether_contracts::{ExecutionPlan, ExecutionTimeouts, ProxySnapshot};
+use serde::{Deserialize, Serialize};
+use serde_json::{Map, Value};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum VideoTaskSyncReportMode {