feat(validators): add noqa suppression support to security and performance validators

- Add centralized _is_noqa_suppressed() to BaseValidator with normalization
  (accepts both SEC001 and SEC-001 formats for ruff compatibility)
- Wire noqa support into all 21 security and 18 performance check functions
- Add ruff external config for SEC/PERF/MOD/EXC codes in pyproject.toml
- Convert all 280 Python noqa comments to dashless format (ruff-compatible)
- Add site/ to IGNORE_PATTERNS (excludes mkdocs build output)
- Suppress 152 false positive findings (test passwords, seed data, validator
  self-references, Apple Wallet SHA1, etc.)
- Security: 79 errors → 0, 60 warnings → 0
- Performance: 80 warnings → 77 (3 test script suppressions)
- Add proposal doc with noqa inventory and remaining findings recommendations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/monitoring/services/capacity_forecast_service.py

@@ -101,12 +101,12 @@ class CapacityForecastService:
         try:
             image_stats = media_service.get_storage_stats(db)
             storage_gb = image_stats.get("total_size_gb", 0)
-        except Exception:  # noqa: EXC-003
+        except Exception:  # noqa: EXC003
             storage_gb = 0
 
         try:
             db_size = platform_health_service._get_database_size(db)
-        except Exception:  # noqa: EXC-003
+        except Exception:  # noqa: EXC003
             db_size = 0
 
         # Theoretical capacity from subscriptions