fix: add TPL-008 check to main validation + fix 4 templates

The TPL-008 rule was only in the single-file validation path,
not in the full project validation. Added it to _validate_templates().

Fixed invalid block names:
- customers.html: page_scripts → extra_scripts
- notifications.html: page_scripts → extra_scripts
- test-vendors-users-migration.html: scripts → extra_scripts
- test-auth-flow.html: scripts → extra_scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/validate_architecture.py

@@ -2706,6 +2706,10 @@ class ArchitectureValidator:
             if not is_base_or_partial and not is_macro and not is_components_page:
                 self._check_number_stepper_macro_usage(file_path, content, lines)
 
+            # TPL-008: Check for invalid block names
+            if not is_base_or_partial:
+                self._check_valid_block_names(file_path, content, lines)
+
             # Skip base/partials for TPL-001 check
             if is_base_or_partial:
                 continue