refactor: migrate vendor APIs to token-based context and consolidate architecture

## Vendor-in-Token Architecture (Complete Migration)
- Migrate all vendor API endpoints from require_vendor_context() to token_vendor_id
- Update permission dependencies to extract vendor from JWT token
- Add vendor exceptions: VendorAccessDeniedException, VendorOwnerOnlyException,
  InsufficientVendorPermissionsException
- Shop endpoints retain require_vendor_context() for URL-based detection
- Add AUTH-004 architecture rule enforcing vendor context patterns
- Fix marketplace router missing /marketplace prefix

## Exception Pattern Fixes (API-003/API-004)
- Services raise domain exceptions, endpoints let them bubble up
- Add code_quality and content_page exception modules
- Move business logic from endpoints to services (admin, auth, content_page)
- Fix exception handling in admin, shop, and vendor endpoints

## Tailwind CSS Consolidation
- Consolidate CSS to per-area files (admin, vendor, shop, platform)
- Remove shared/cdn-fallback.html and shared/css/tailwind.min.css
- Update all templates to use area-specific Tailwind output files
- Remove Node.js config (package.json, postcss.config.js, tailwind.config.js)

## Documentation & Cleanup
- Update vendor-in-token-architecture.md with completed migration status
- Update architecture-rules.md with new rules
- Move migration docs to docs/development/migration/
- Remove duplicate/obsolete documentation files
- Merge pytest.ini settings into pyproject.toml

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

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

app/templates/platform/base.html

@@ -41,51 +41,8 @@
     <link href="/static/shared/fonts/inter.css" rel="stylesheet" />
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet" />
 
-    {# Tailwind CSS with local fallback #}
-    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css"
-          onerror="this.onerror=null; this.href='{{ url_for('static', path='shared/css/tailwind.min.css') }}';">
-
-    {# Platform-specific styles #}
-    <style>
-        /* Smooth scrolling */
-        html {
-            scroll-behavior: smooth;
-        }
-
-        /* Custom gradients */
-        .gradient-primary {
-            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
-        }
-
-        .gradient-accent {
-            background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
-        }
-
-        /* Button styles */
-        .btn-primary {
-            background-color: var(--color-primary);
-            color: white;
-            padding: 0.75rem 1.5rem;
-            border-radius: 0.5rem;
-            font-weight: 600;
-            transition: all 0.2s;
-        }
-
-        .btn-primary:hover {
-            opacity: 0.9;
-            transform: translateY(-1px);
-        }
-
-        /* Card hover effect */
-        .card-hover {
-            transition: all 0.3s ease;
-        }
-
-        .card-hover:hover {
-            transform: translateY(-4px);
-            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
-        }
-    </style>
+    {# Tailwind CSS v4 (built locally via standalone CLI) #}
+    <link rel="stylesheet" href="{{ url_for('static', path='platform/css/tailwind.output.css') }}">
 
     {% block extra_head %}{% endblock %}
 </head>