refactor(backend)!: separate algorithm and data layers

Reorganize algorithm packages by business responsibility, move orchestration into services, and keep database access behind pooled repositories.

Harden analysis API validation, remove unsafe legacy simulation endpoints, and add regression and architecture boundary coverage.

BREAKING CHANGE: legacy algorithm module paths and obsolete simulation endpoints are removed.

app/api/v1/endpoints/burst_detection.py

@@ -4,6 +4,7 @@ from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Body
 from pydantic import BaseModel, Field
+from starlette.concurrency import run_in_threadpool
 
 from app.auth.keycloak_dependencies import get_current_keycloak_username
 from app.services.burst_detection import (
@@ -73,6 +74,10 @@ async def detect_burst(
         HTTPException: 当处理过程中发生错误时
     """
     try:
-        return run_burst_detection(**data.model_dump(), username=username)
+        return await run_in_threadpool(
+            run_burst_detection,
+            **data.model_dump(),
+            username=username,
+        )
     except Exception as exc:
         raise HTTPException(status_code=400, detail=str(exc))