chore(lint): auto-fix 253 of 283 ruff issues (F401, I001, E402, RUF100, UP037, SIM105)

Mass ruff auto-fix:
  - ruff check --fix: 109 issues fixed (F401 unused imports,
    I001 unsorted imports, UP037 quoted annotations, SIM105
    suppressible exception, RUF100 unused-noqa)
  - ruff check --fix --unsafe-fixes: 22 additional issues
  - ruff format: 70 files reformatted
  - Manual pass: fix 16 misplaced import httpx lines
  - Manual pass: fix remaining E402 (import-after-docstring)

Result: 283 errors -> 30 errors.

The remaining 30 are real issues that need manual review:
  5 F401 unused-import (likely auto-generated stubs)
  5 F821 undefined-name (real bugs in code that references
    redis/pydantic/LLMRegistry without imports)
  3 BLE001 (the compliance LLM fallback is intentional; the
    other two are real)
  3 RUF012 mutable-class-default
  3 SIM105, 3 SIM117, 2 E722, 2 E741
  1 B007, 1 B025, 1 E402, 1 RUF200 (pyproject.toml issue)

Tests: 436/437 pass (1 pre-existing SSE sandbox failure).
format check + import sort: now clean.
make ci: still gated on the 30 remaining real issues.
Follow-up: triage the 30 issues file-by-file.

api.py

@@ -65,7 +65,9 @@ logger = logging.getLogger(__name__)
 # service, and event. setup_logging() bridges stdlib logging through
 # structlog so that any logger.info("event", k=v) becomes a JSON record.
 try:
-    from logging_config import setup_logging, get_logger as _get_logger
+    from logging_config import get_logger as _get_logger
+    from logging_config import setup_logging
+
     setup_logging()
     logger = _get_logger(__name__)
 except ImportError:
@@ -649,7 +651,7 @@ async def scrape(request: ScrapeRequest) -> dict[str, Any]:
         return response
     except PryError:
         raise
-    except Exception as e:  # noqa: BLE001
+    except Exception as e:
         raise ExternalServiceError(str(e)) from e
 
 
@@ -934,7 +936,7 @@ async def _run_crawl_job(job_id: str, request: CrawlRequest) -> None:
             },
         )
         await queue.complete_job(job_id, {"pages": pages})
-    except Exception as e:  # noqa: BLE001
+    except Exception as e:
         logger.exception("crawl_job_failed", extra={"job_id": job_id, "url": request.url})
         await queue.fail_job(job_id, str(e))
 
@@ -976,7 +978,7 @@ async def parse_document(request: ParseRequest) -> dict[str, Any]:
         return {"success": True, "data": result}
     except PryError:
         raise
-    except Exception as e:  # noqa: BLE001
+    except Exception as e:
         raise ExternalServiceError(str(e)) from e
 
 
@@ -3134,6 +3136,7 @@ async def list_schemas() -> dict[str, Any]:
 # ── Auth ──
 # (split into routers/auth.py on the api-router-split refactor)
 from routers.auth import router as auth_router
+
 app.include_router(auth_router)
 
 # ── Review ──
@@ -4051,6 +4054,7 @@ async def proxy_signup(provider: str = Body(...)) -> dict[str, Any]:
     url = pm.get_signup_link(provider)
     return {"success": True, "data": {"signup_url": url, "provider": provider}}
 
+
 @app.get("/v1/proxy/referrals", tags=["Proxy"], summary="List proxy provider affiliate referrals")
 async def list_proxy_referrals() -> dict[str, Any]:
     """Return the curated proxy provider affiliate catalog (proxy_referrals.py).
@@ -4074,7 +4078,9 @@ async def list_proxy_referrals() -> dict[str, Any]:
     }
 
 
-@app.get("/v1/proxy/referrals/{tag}", tags=["Proxy"], summary="Get a single proxy provider referral")
+@app.get(
+    "/v1/proxy/referrals/{tag}", tags=["Proxy"], summary="Get a single proxy provider referral"
+)
 async def get_proxy_referral(tag: str) -> dict[str, Any]:
     """Return the affiliate info for a single proxy provider by tag."""
     from proxy_manager import ProxyManager