refactor ai serving modules and crates

apps/aether-gateway/src/ai_serving/planner/standard/openai/mod.rs

@@ -0,0 +1,20 @@
+mod chat;
+mod responses;
+
+pub(crate) use crate::ai_serving::{
+    copy_request_number_field, copy_request_number_field_as,
+    map_openai_reasoning_effort_to_claude_output, map_openai_reasoning_effort_to_gemini_budget,
+    parse_openai_stop_sequences, resolve_openai_chat_max_tokens, value_as_u64,
+};
+pub(crate) use chat::{
+    build_local_openai_chat_stream_plan_and_reports_for_kind,
+    build_local_openai_chat_sync_plan_and_reports_for_kind,
+    maybe_build_stream_local_decision_payload, maybe_build_sync_local_decision_payload,
+    set_local_openai_chat_execution_exhausted_diagnostic,
+};
+pub(crate) use responses::{
+    build_local_openai_responses_stream_plan_and_reports_for_kind,
+    build_local_openai_responses_sync_plan_and_reports_for_kind,
+    maybe_build_stream_local_openai_responses_decision_payload,
+    maybe_build_sync_local_openai_responses_decision_payload,
+};