refactor: 移除 Python 后端源码，全面迁移至 Rust gateway 架构

- 删除全部 Python 源码 (src/) 及 Alembic 迁移脚本，归档至 _deprecated_py_src/
- 重构 Rust gateway ai_pipeline: 拆分 planner/finalize 模块，新增 contracts/adaptation 层
- 重组 handlers 模块为 admin/public/proxy/internal/shared 子模块结构
- 新增 executor 模块，引入 Rust 原生数据库迁移 (aether-data/migrations)
- 简化 CI/Docker 构建流程，移除 base image 二级构建，统一为单一 app image
- 移除 Python 相关基础设施文件 (entrypoint.sh, gunicorn_conf.py, Dockerfile.base)

_deprecated_py_src/services/billing/collector_defs/__init__.py

@@ -0,0 +1,31 @@
+"""
+Collector definitions (config-file mode).
+
+Goal:
+- Developers define dimension collectors in code, grouped by api_format.
+- Adding support for a new api_format should only require adding a new file here.
+- No DB seeding required.
+
+Each module should export:
+- COLLECTORS: list[dict[str, Any]]
+
+Each dict supports keys (aligned with DimensionCollector):
+- api_format: "openai:chat" (canonical family:kind)
+- task_type: "chat" | "cli" | "video" | "image" | "audio"
+- dimension_name: string
+- source_type: "request" | "response" | "metadata" | "computed"
+- source_path: string | None
+- value_type: "float" | "int" | "string"
+- transform_expression: string | None
+- default_value: string | None
+- priority: int
+- is_enabled: bool
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+# This package is discovered dynamically by `src.services.billing.presets`.
+
+COLLECTORS: list[dict[str, Any]] = []

_deprecated_py_src/services/billing/collector_defs/claude_chat.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Any
+
+# Anthropic / Claude messages
+COLLECTORS: list[dict[str, Any]] = [
+    {
+        "api_format": "claude:chat",
+        "task_type": "chat",
+        "dimension_name": "input_tokens",
+        "source_type": "response",
+        "source_path": "usage.input_tokens",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "claude:chat",
+        "task_type": "chat",
+        "dimension_name": "output_tokens",
+        "source_type": "response",
+        "source_path": "usage.output_tokens",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+]

_deprecated_py_src/services/billing/collector_defs/gemini_chat.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Any
+
+# Gemini generateContent
+COLLECTORS: list[dict[str, Any]] = [
+    {
+        "api_format": "gemini:chat",
+        "task_type": "chat",
+        "dimension_name": "input_tokens",
+        "source_type": "response",
+        "source_path": "usageMetadata.promptTokenCount",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "gemini:chat",
+        "task_type": "chat",
+        "dimension_name": "output_tokens",
+        "source_type": "response",
+        "source_path": "usageMetadata.candidatesTokenCount",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+]

_deprecated_py_src/services/billing/collector_defs/openai_chat.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Any
+
+# OpenAI chat completions
+COLLECTORS: list[dict[str, Any]] = [
+    {
+        "api_format": "openai:chat",
+        "task_type": "chat",
+        "dimension_name": "input_tokens",
+        "source_type": "response",
+        "source_path": "usage.prompt_tokens",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "openai:chat",
+        "task_type": "chat",
+        "dimension_name": "output_tokens",
+        "source_type": "response",
+        "source_path": "usage.completion_tokens",
+        "value_type": "int",
+        "priority": 10,
+        "is_enabled": True,
+    },
+]

_deprecated_py_src/services/billing/collector_defs/video_common.py

@@ -0,0 +1,116 @@
+from __future__ import annotations
+
+from typing import Any
+
+# Async video finalize flow: extra dims from metadata (base_dimensions already provided by caller).
+#
+# Note:
+# - DimensionCollectorService has a "video -> base api_format fallback" that may query
+#   base api_format collectors when api_format is "openai:video"/"gemini:video" etc.
+COLLECTORS: list[dict[str, Any]] = [
+    # Prefer size as "resolution key" (e.g. 1024x1792), fallback to resolution label (e.g. 720p/4k).
+    {
+        "api_format": "openai:chat",
+        "task_type": "video",
+        "dimension_name": "video_resolution_key",
+        "source_type": "metadata",
+        "source_path": "task.size",
+        "value_type": "string",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "openai:chat",
+        "task_type": "video",
+        "dimension_name": "video_resolution_key",
+        "source_type": "metadata",
+        "source_path": "task.resolution",
+        "value_type": "string",
+        "priority": 0,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "openai:chat",
+        "task_type": "video",
+        "dimension_name": "video_size_bytes",
+        "source_type": "metadata",
+        "source_path": "task.video_size_bytes",
+        "value_type": "int",
+        "priority": 0,
+        "is_enabled": True,
+    },
+    # 实际视频时长（秒），优先使用从 provider 响应中提取的实际时长
+    {
+        "api_format": "openai:chat",
+        "task_type": "video",
+        "dimension_name": "video_duration_seconds",
+        "source_type": "metadata",
+        "source_path": "task.video_duration_seconds",
+        "value_type": "float",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    # 回退到请求的 duration_seconds（如果没有实际时长）
+    {
+        "api_format": "openai:chat",
+        "task_type": "video",
+        "dimension_name": "video_duration_seconds",
+        "source_type": "metadata",
+        "source_path": "task.duration_seconds",
+        "value_type": "int",
+        "priority": 0,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "gemini:chat",
+        "task_type": "video",
+        "dimension_name": "video_resolution_key",
+        "source_type": "metadata",
+        "source_path": "task.size",
+        "value_type": "string",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "gemini:chat",
+        "task_type": "video",
+        "dimension_name": "video_resolution_key",
+        "source_type": "metadata",
+        "source_path": "task.resolution",
+        "value_type": "string",
+        "priority": 0,
+        "is_enabled": True,
+    },
+    {
+        "api_format": "gemini:chat",
+        "task_type": "video",
+        "dimension_name": "video_size_bytes",
+        "source_type": "metadata",
+        "source_path": "task.video_size_bytes",
+        "value_type": "int",
+        "priority": 0,
+        "is_enabled": True,
+    },
+    # 实际视频时长（秒），优先使用从 provider 响应中提取的实际时长
+    {
+        "api_format": "gemini:chat",
+        "task_type": "video",
+        "dimension_name": "video_duration_seconds",
+        "source_type": "metadata",
+        "source_path": "task.video_duration_seconds",
+        "value_type": "float",
+        "priority": 10,
+        "is_enabled": True,
+    },
+    # 回退到请求的 duration_seconds（如果没有实际时长）
+    {
+        "api_format": "gemini:chat",
+        "task_type": "video",
+        "dimension_name": "video_duration_seconds",
+        "source_type": "metadata",
+        "source_path": "task.duration_seconds",
+        "value_type": "int",
+        "priority": 0,
+        "is_enabled": True,
+    },
+]