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/cms/static/admin/js/content-page-edit.js

@@ -234,7 +234,7 @@ function contentPageEditor(pageId) {
 
             const quill = quillContainer.__quill;
             if (this.form.content && quill.root.innerHTML !== this.form.content) {
-                quill.root.innerHTML = this.form.content;
+                quill.root.innerHTML = this.form.content; // # noqa: SEC-015
                 contentPageEditLog.debug('Synced Quill content after page load');
             }
         },