feat: complete CMS as fully autonomous self-contained module

Transform CMS from a thin wrapper into a fully self-contained module with
all code living within app/modules/cms/:

Module Structure:
- models/: ContentPage model (canonical location with dynamic discovery)
- schemas/: Pydantic schemas for API validation
- services/: ContentPageService business logic
- exceptions/: Module-specific exceptions
- routes/api/: REST API endpoints (admin, vendor, shop)
- routes/pages/: HTML page routes (admin, vendor)
- templates/cms/: Jinja2 templates (namespaced)
- static/: JavaScript files (admin/vendor)
- locales/: i18n translations (en, fr, de, lb)

Key Changes:
- Move ContentPage model to module with dynamic model discovery
- Create Pydantic schemas package for request/response validation
- Extract API routes from app/api/v1/*/ to module
- Extract page routes from admin_pages.py/vendor_pages.py to module
- Move static JS files to module with dedicated mount point
- Update templates to use cms_static for module assets
- Add module static file mounting in main.py
- Delete old scattered files (no shims - hard errors on old imports)

This establishes the pattern for migrating other modules to be
fully autonomous and independently deployable.

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

app/routes/admin_pages.py

@@ -44,7 +44,6 @@ Routes:
 
 from fastapi import APIRouter, Depends, Path, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
-from fastapi.templating import Jinja2Templates
 from sqlalchemy.orm import Session
 
 from app.api.deps import (
@@ -53,11 +52,11 @@ from app.api.deps import (
     require_menu_access,
 )
 from app.core.config import settings
+from app.templates_config import templates
 from models.database.admin_menu_config import FrontendType
 from models.database.user import User
 
 router = APIRouter()
-templates = Jinja2Templates(directory="app/templates")
 
 
 # ============================================================================
@@ -1278,88 +1277,8 @@ async def admin_platform_modules(
 # ============================================================================
 # CONTENT MANAGEMENT SYSTEM (CMS) ROUTES
 # ============================================================================
-
-
-@router.get("/platform-homepage", include_in_schema=False)
-async def admin_platform_homepage_manager(
-    request: Request,
-    current_user: User = Depends(require_menu_access("platforms", FrontendType.ADMIN)),
-    db: Session = Depends(get_db),
-):
-    """
-    Deprecated: Redirects to platforms page.
-
-    Platform homepages are now managed via:
-    - /admin/platforms → Select platform → Homepage button
-    - Or directly: /admin/content-pages?platform_code={code}&slug=home
-    """
-    return RedirectResponse(url="/admin/platforms", status_code=302)
-
-
-@router.get("/content-pages", response_class=HTMLResponse, include_in_schema=False)
-async def admin_content_pages_list(
-    request: Request,
-    current_user: User = Depends(require_menu_access("content-pages", FrontendType.ADMIN)),
-    db: Session = Depends(get_db),
-):
-    """
-    Render content pages list.
-    Shows all platform defaults and vendor overrides with filtering.
-    """
-    return templates.TemplateResponse(
-        "admin/content-pages.html",
-        {
-            "request": request,
-            "user": current_user,
-        },
-    )
-
-
-@router.get(
-    "/content-pages/create", response_class=HTMLResponse, include_in_schema=False
-)
-async def admin_content_page_create(
-    request: Request,
-    current_user: User = Depends(require_menu_access("content-pages", FrontendType.ADMIN)),
-    db: Session = Depends(get_db),
-):
-    """
-    Render create content page form.
-    Allows creating new platform defaults or vendor-specific pages.
-    """
-    return templates.TemplateResponse(
-        "admin/content-page-edit.html",
-        {
-            "request": request,
-            "user": current_user,
-            "page_id": None,  # Indicates this is a create operation
-        },
-    )
-
-
-@router.get(
-    "/content-pages/{page_id}/edit",
-    response_class=HTMLResponse,
-    include_in_schema=False,
-)
-async def admin_content_page_edit(
-    request: Request,
-    page_id: int = Path(..., description="Content page ID"),
-    current_user: User = Depends(require_menu_access("content-pages", FrontendType.ADMIN)),
-    db: Session = Depends(get_db),
-):
-    """
-    Render edit content page form.
-    Allows editing existing platform or vendor content pages.
-    """
-    return templates.TemplateResponse(
-        "admin/content-page-edit.html",
-        {
-            "request": request,
-            "user": current_user,
-            "page_id": page_id,
-        },
-    )
+# NOTE: CMS routes moved to self-contained module: app.modules.cms.routes.pages.admin
+# Routes are registered directly in main.py from the CMS module
 
 
 # ============================================================================