refactor: update registry and main.py for module auto-discovery

- app/modules/registry.py: Use auto-discovery from discovery.py
- main.py: Integrate module route auto-discovery
- app/routes/vendor_pages.py: Remove routes now handled by modules

The registry now dynamically discovers modules from definition.py
files instead of hardcoded imports.

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

main.py

@@ -61,12 +61,11 @@ from app.core.lifespan import lifespan
 from app.exceptions import ServiceUnavailableException
 from app.exceptions.handler import setup_exception_handlers
 
-# Import page routers
+# Import page routers (legacy routes - will be migrated to modules)
 from app.routes import admin_pages, platform_pages, shop_pages, vendor_pages
 
-# Import CMS module page routers (self-contained module)
-from app.modules.cms.routes.pages import admin_router as cms_admin_pages
-from app.modules.cms.routes.pages import vendor_router as cms_vendor_pages
+# Module route auto-discovery
+from app.modules.routes import discover_module_routes, get_vendor_page_routes
 from app.utils.i18n import get_jinja2_globals
 from middleware.context import ContextMiddleware
 from middleware.language import LanguageMiddleware
@@ -330,6 +329,7 @@ app.include_router(
 )
 
 # Vendor management pages (dashboard, products, orders, etc.)
+# NOTE: Legacy routes - modules with their own routes will override these
 logger.info("Registering vendor page routes: /vendor/{code}/*")
 app.include_router(
     vendor_pages.router,
@@ -338,12 +338,32 @@ app.include_router(
     include_in_schema=False,
 )
 
-# CMS module vendor pages (self-contained module)
-# NOTE: Includes catch-all /{vendor_code}/{slug} - must be registered AFTER vendor_pages
-logger.info("Registering CMS vendor page routes: /vendor/{code}/content-pages/*")
-app.include_router(
-    cms_vendor_pages, prefix="/vendor", tags=["cms-vendor-pages"], include_in_schema=False
-)
+# =============================================================================
+# AUTO-DISCOVERED MODULE ROUTES
+# =============================================================================
+# Self-contained modules register their routes automatically.
+# Routes are discovered from app/modules/*/routes/pages/ and routes/api/
+# NOTE: CMS has catch-all route, so it's registered last via priority sorting
+
+logger.info("Auto-discovering module page routes...")
+vendor_page_routes = get_vendor_page_routes()
+
+# Sort routes: CMS last (has catch-all), others alphabetically
+def route_priority(route):
+    if route.module_code == "cms":
+        return (1, route.module_code)  # CMS last
+    return (0, route.module_code)
+
+vendor_page_routes.sort(key=route_priority)
+
+for route_info in vendor_page_routes:
+    logger.info(f"  Registering {route_info.module_code} vendor pages: {route_info.prefix}")
+    app.include_router(
+        route_info.router,
+        prefix=route_info.prefix,
+        tags=route_info.tags,
+        include_in_schema=route_info.include_in_schema,
+    )
 
 # Customer shop pages - Register at TWO prefixes:
 # 1. /shop/* (for subdomain/custom domain modes)