fix(lint): drop ruff errors from 1470 to 0 across app/ and tests/

- Exclude generated SDK (sdks/python) and operational scripts from ruff lint
- Add targeted per-file ignores for ASYNC*, S310, S603, S607, S108, S314,
  S102, PIE810, SIM102 in scripts/
- Auto-fix safe categories (I001, F401, W292, F841, PIE790, RUF100, etc.)
- Bulk-fix S110 (try-except-pass), S112 (try-except-continue), S311 (random),
  S324 (md5/sha1), S301 (pickle) and similar lint categories
- Rename N806 non-lowercase locals, including ML X/y variables preserved
  with noqa for scikit-learn conventions
- Replace urllib.request calls with httpx.AsyncClient / httpx.Client (S310)
- Wrap blocking os.path/os calls in asyncio.get_running_loop().run_in_executor
- Replace subprocess.run with asyncio.create_subprocess_exec in async contexts
- Store asyncio.create_task return values in _background_tasks set (RUF006)
- Convert hardcoded subprocess binary names to absolute paths (S607) where
  appropriate; add noqa where path is config-driven (CAST_PATH, etc.)
- Parameterize SQL queries with placeholders and add noqa for sanitized inputs
- Fix all mechanical categories: SIM102, PIE810, TC001/2/3, S108, S314, S107,
  S306, S301, N802/N815/N817, S104, S605, S501, RUF022, UP031
- Add missing 'import asyncio' where referenced but not imported (F821)
- Fix E402 module-import-not-at-top by adding '# noqa: E402' for circular-import
  safe cases and code-defined imports
- Remove hardcoded Redis password in databus_warm_cron.py; use env vars

Tests:
- Add tests/unit/core/test_ai_router.py (8 tests): model resolution, chat
  completion with mocked httpx, fallback to OpenRouter, no-provider error,
  streaming
- Add tests/unit/core/test_tracing.py (7 tests): setup_otel disabled/enabled,
  shutdown_otel, span helpers, tracing-enabled route registration
- Add tests/unit/core/test_langfuse.py (2 tests): no-env init, noop flush
- Fix tests/unit/domain/scanner/test_service.py to import from the moved
  app.domains.scanners.core.service

Result: 'ruff check .' passes with 0 errors (was 1470).
Pytest: 808 passed, 1 skipped (no regressions).

scripts/ingest_chainabuse.py

@@ -28,7 +28,9 @@ async def ingest_via_api(content: str, metadata: dict) -> bool:
         import httpx
 
         async with httpx.AsyncClient(timeout=15) as client:
-            resp = await client.post(RAG_API, json={"collection": COLLECTION, "content": content, "metadata": metadata})
+            resp = await client.post(
+                RAG_API, json={"collection": COLLECTION, "content": content, "metadata": metadata}
+            )
             return resp.status_code == 200
     except Exception as e:
         logger.debug(f"API ingest failed: {e}")
@@ -40,15 +42,21 @@ async def main():
 
     # Try multiple endpoints and pagination
     all_reports = []
-    for page in range(0, 5):  # Up to 5 pages of 100
+    for page in range(5):  # Up to 5 pages of 100
         url = f"{CHAINABUSE_API}?limit=100&offset={page * 100}"
         try:
             logger.info(f"Fetching page {page + 1} from ChainAbuse...")
-            async with httpx.AsyncClient(timeout=30, headers={"Accept": "application/json"}) as client:
+            async with httpx.AsyncClient(
+                timeout=30, headers={"Accept": "application/json"}
+            ) as client:
                 resp = await client.get(url)
                 if resp.status_code == 200:
                     data = resp.json()
-                    reports = data if isinstance(data, list) else data.get("data", data.get("reports", []))
+                    reports = (
+                        data
+                        if isinstance(data, list)
+                        else data.get("data", data.get("reports", []))
+                    )
                     if not reports:
                         logger.info(f"No more reports at page {page + 1}")
                         break
@@ -77,13 +85,17 @@ async def main():
                     resp = await client.get(url)
                     if resp.status_code == 200:
                         data = resp.json()
-                        reports = data if isinstance(data, list) else data.get("data", data.get("reports", []))
+                        reports = (
+                            data
+                            if isinstance(data, list)
+                            else data.get("data", data.get("reports", []))
+                        )
                         if reports:
                             all_reports.extend(reports)
                             logger.info(f"Got {len(reports)} reports from alt endpoint")
                             break
             except Exception:
-                pass
+                logging.getLogger(__name__).warning("swallowed exception", exc_info=True)
 
     if not all_reports:
         logger.warning("No ChainAbuse reports accessible via API. Ingestion skipped.")