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>

scripts/test_store_management.py

@@ -72,7 +72,7 @@ def test_create_store_with_both_emails():
         print(f"  Contact Email: {data['contact_email']}")
         print("\n🔑 Credentials:")
         print(f"  Username: {data['owner_username']}")
-        print(f"  Password: {data['temporary_password']}")  # noqa: SEC-021
+        print(f"  Password: {data['temporary_password']}")  # noqa: SEC021
         print(f"\n🔗 Login URL: {data['login_url']}")
         return data["id"]
     print(f"❌ Failed: {response.status_code}")