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/api/v1/admin/content_pages.py

@@ -10,7 +10,7 @@ Platform administrators can:
 
 import logging
 
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, Query
 from pydantic import BaseModel, Field
 from sqlalchemy.orm import Session
 
@@ -170,28 +170,9 @@ def list_all_pages(
 
     Filter by vendor_id to see specific vendor pages.
     """
-    if vendor_id:
-        pages = content_page_service.list_all_vendor_pages(
-            db, vendor_id=vendor_id, include_unpublished=include_unpublished
-        )
-    else:
-        # Get all pages (both platform and vendor)
-        from sqlalchemy import and_
-
-        from models.database.content_page import ContentPage
-
-        filters = []
-        if not include_unpublished:
-            filters.append(ContentPage.is_published == True)
-
-        pages = (
-            db.query(ContentPage)
-            .filter(and_(*filters) if filters else True)
-            .order_by(
-                ContentPage.vendor_id, ContentPage.display_order, ContentPage.title
-            )
-            .all()
-        )
+    pages = content_page_service.list_all_pages(
+        db, vendor_id=vendor_id, include_unpublished=include_unpublished
+    )
 
     return [page.to_dict() for page in pages]
 
@@ -203,11 +184,7 @@ def get_page(
     db: Session = Depends(get_db),
 ):
     """Get a specific content page by ID."""
-    page = content_page_service.get_page_by_id(db, page_id)
-
-    if not page:
-        raise HTTPException(status_code=404, detail="Content page not found")
-
+    page = content_page_service.get_page_by_id_or_raise(db, page_id)
     return page.to_dict()
 
 
@@ -219,7 +196,7 @@ def update_page(
     db: Session = Depends(get_db),
 ):
     """Update a content page (platform or vendor)."""
-    page = content_page_service.update_page(
+    page = content_page_service.update_page_or_raise(
         db,
         page_id=page_id,
         title=page_data.title,
@@ -234,10 +211,6 @@ def update_page(
         display_order=page_data.display_order,
         updated_by=current_user.id,
     )
-
-    if not page:
-        raise HTTPException(status_code=404, detail="Content page not found")
-
     return page.to_dict()
 
 
@@ -248,9 +221,4 @@ def delete_page(
     db: Session = Depends(get_db),
 ):
     """Delete a content page."""
-    success = content_page_service.delete_page(db, page_id)
-
-    if not success:
-        raise HTTPException(status_code=404, detail="Content page not found")
-
-    return
+    content_page_service.delete_page_or_raise(db, page_id)