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/marketplace/schemas/marketplace_import_job.py

@@ -25,8 +25,8 @@ class MarketplaceImportJobRequest(BaseModel):
     @field_validator("source_url")
     @classmethod
     def validate_url(cls, v):
-        if not v.startswith(("http://", "https://")):  # SEC-034
-            raise ValueError("URL must start with http:// or https://")  # SEC-034
+        if not v.startswith(("http://", "https://")):  # noqa: SEC034
+            raise ValueError("URL must start with http:// or https://")  # noqa: SEC034
         return v.strip()
 
     @field_validator("marketplace")
@@ -64,8 +64,8 @@ class AdminMarketplaceImportJobRequest(BaseModel):
     @field_validator("source_url")
     @classmethod
     def validate_url(cls, v):
-        if not v.startswith(("http://", "https://")):  # SEC-034
-            raise ValueError("URL must start with http:// or https://")  # SEC-034
+        if not v.startswith(("http://", "https://")):  # noqa: SEC034
+            raise ValueError("URL must start with http:// or https://")  # noqa: SEC034
         return v.strip()
 
     @field_validator("marketplace")