feat: integrate CMS content pages with platform homepage

Update platform homepage to dynamically load header and footer navigation
from the CMS content pages instead of hardcoded values:

- Import content_page_service in platform_pages.py
- Update get_platform_context() to fetch pages with show_in_header=True
  and show_in_footer=True from the database
- Add generic /{slug} route to serve CMS content pages (about, contact,
  faq, privacy, terms, etc.)
- Platform pages use vendor_id=None for platform-wide defaults

Pages can be managed via Admin > Content Pages with:
- show_in_header: Display in header navigation
- show_in_footer: Display in footer quick links
- display_order: Control menu ordering

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

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

app/routes/platform_pages.py

@@ -9,13 +9,14 @@ Letzshop vendor finder, and signup wizard.
 import logging
 from pathlib import Path
 
-from fastapi import APIRouter, Depends, Request
+from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from sqlalchemy.orm import Session
 
 from app.core.config import settings
 from app.core.database import get_db
+from app.services.content_page_service import content_page_service
 from app.utils.i18n import get_jinja2_globals
 
 router = APIRouter()
@@ -34,7 +35,6 @@ def get_platform_context(request: Request, db: Session) -> dict:
 
     # Get translation function
     i18n_globals = get_jinja2_globals(language)
-    t = i18n_globals["t"]
 
     context = {
         "request": request,
@@ -47,12 +47,25 @@ def get_platform_context(request: Request, db: Session) -> dict:
     # Add i18n globals (_, t, current_language, SUPPORTED_LANGUAGES, etc.)
     context.update(i18n_globals)
 
-    # Add footer CMS pages
-    context["footer_pages"] = [
-        {"slug": "about", "title": t("platform.footer.about")},
-        {"slug": "faq", "title": t("platform.footer.faq")},
-        {"slug": "contact", "title": t("platform.footer.contact_us")},
-    ]
+    # Load CMS pages for header and footer navigation
+    header_pages = []
+    footer_pages = []
+    try:
+        # Platform pages have vendor_id=None
+        header_pages = content_page_service.list_pages_for_vendor(
+            db, vendor_id=None, header_only=True, include_unpublished=False
+        )
+        footer_pages = content_page_service.list_pages_for_vendor(
+            db, vendor_id=None, footer_only=True, include_unpublished=False
+        )
+        logger.debug(
+            f"Loaded CMS pages: {len(header_pages)} header, {len(footer_pages)} footer"
+        )
+    except Exception as e:
+        logger.error(f"Failed to load CMS navigation pages: {e}")
+
+    context["header_pages"] = header_pages
+    context["footer_pages"] = footer_pages
 
     return context
 
@@ -271,3 +284,39 @@ async def signup_success_page(
         "platform/signup-success.html",
         context,
     )
+
+
+# =============================================================================
+# Generic Content Pages (CMS)
+# =============================================================================
+# IMPORTANT: This route must be LAST as it catches all /{slug} URLs
+
+
+@router.get("/{slug}", response_class=HTMLResponse, name="platform_content_page")
+async def content_page(
+    request: Request,
+    slug: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Serve CMS content pages (about, contact, faq, privacy, terms, etc.).
+
+    This is a catch-all route for dynamic content pages managed via the admin CMS.
+    Platform pages have vendor_id=None.
+    """
+    # Load content page from database (platform defaults only)
+    page = content_page_service.get_page_for_vendor(
+        db, slug=slug, vendor_id=None, include_unpublished=False
+    )
+
+    if not page:
+        raise HTTPException(status_code=404, detail=f"Page not found: {slug}")
+
+    context = get_platform_context(request, db)
+    context["page"] = page
+    context["page_title"] = page.title
+
+    return templates.TemplateResponse(
+        "platform/content-page.html",
+        context,
+    )