feat: add complete company management UI

- Create companies list page with stats (total, verified, active, vendor count)
- Add company creation form with owner account generation
- Implement companies.js with full CRUD operations (list, create, edit, delete)
- Add Companies menu item to admin sidebar (desktop + mobile)
- Create company admin page routes (/admin/companies, /admin/companies/create)
- Register companies API router in admin __init__.py

Features:
- List all companies with pagination
- Create company with automatic owner user creation
- Display temporary password for new owner accounts
- Edit company information
- Delete company (only if no vendors)
- Toggle active/verified status
- Show vendor count per company

UI Components:
- Stats cards (total companies, verified, active, total vendors)
- Company table with status badges
- Create form with validation
- Success/error messaging
- Responsive design with dark mode support

app/routes/admin_pages.py

@@ -17,6 +17,7 @@ Routes:
 - GET /vendors/{vendor_code} → Vendor details (auth required)
 - GET /vendors/{vendor_code}/edit → Edit vendor form (auth required)
 - GET /vendors/{vendor_code}/domains → Vendor domains management (auth required)
+- GET /vendor-themes → Vendor themes selection page (auth required)
 - GET /vendors/{vendor_code}/theme → Vendor theme editor (auth required)
 - GET /users         → User management page (auth required)
 - GET /imports       → Import history page (auth required)
@@ -109,6 +110,48 @@ async def admin_dashboard_page(
     )
 
 
+# ============================================================================
+# COMPANY MANAGEMENT ROUTES
+# ============================================================================
+
+
+@router.get("/companies", response_class=HTMLResponse, include_in_schema=False)
+async def admin_companies_list_page(
+    request: Request,
+    current_user: User = Depends(get_current_admin_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render companies management page.
+    Shows list of all companies with stats.
+    """
+    return templates.TemplateResponse(
+        "admin/companies.html",
+        {
+            "request": request,
+            "user": current_user,
+        },
+    )
+
+
+@router.get("/companies/create", response_class=HTMLResponse, include_in_schema=False)
+async def admin_company_create_page(
+    request: Request,
+    current_user: User = Depends(get_current_admin_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render company creation form.
+    """
+    return templates.TemplateResponse(
+        "admin/company-create.html",
+        {
+            "request": request,
+            "user": current_user,
+        },
+    )
+
+
 # ============================================================================
 # VENDOR MANAGEMENT ROUTES
 # ============================================================================
@@ -231,6 +274,25 @@ async def admin_vendor_domains_page(
 # ============================================================================
 
 
+@router.get("/vendor-themes", response_class=HTMLResponse, include_in_schema=False)
+async def admin_vendor_themes_page(
+    request: Request,
+    current_user: User = Depends(get_current_admin_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render vendor themes selection page.
+    Allows admins to select a vendor to customize their theme.
+    """
+    return templates.TemplateResponse(
+        "admin/vendor-themes.html",
+        {
+            "request": request,
+            "user": current_user,
+        },
+    )
+
+
 @router.get(
     "/vendors/{vendor_code}/theme", response_class=HTMLResponse, include_in_schema=False
 )
@@ -302,6 +364,25 @@ async def admin_imports_page(
     )
 
 
+@router.get("/marketplace", response_class=HTMLResponse, include_in_schema=False)
+async def admin_marketplace_page(
+    request: Request,
+    current_user: User = Depends(get_current_admin_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render marketplace import management page.
+    Allows admins to import products for any vendor and monitor all imports.
+    """
+    return templates.TemplateResponse(
+        "admin/marketplace.html",
+        {
+            "request": request,
+            "user": current_user,
+        },
+    )
+
+
 # ============================================================================
 # SETTINGS ROUTES
 # ============================================================================
@@ -326,6 +407,25 @@ async def admin_settings_page(
     )
 
 
+@router.get("/logs", response_class=HTMLResponse, include_in_schema=False)
+async def admin_logs_page(
+    request: Request,
+    current_user: User = Depends(get_current_admin_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render admin logs viewer page.
+    View database and file logs with filtering and search.
+    """
+    return templates.TemplateResponse(
+        "admin/logs.html",
+        {
+            "request": request,
+            "user": current_user,
+        },
+    )
+
+
 # ============================================================================
 # CONTENT MANAGEMENT SYSTEM (CMS) ROUTES
 # ============================================================================