refactor: migrate templates and static files to self-contained modules

Templates Migration:
- Migrate admin templates to modules (tenancy, billing, monitoring, marketplace, etc.)
- Migrate vendor templates to modules (tenancy, billing, orders, messaging, etc.)
- Migrate storefront templates to modules (catalog, customers, orders, cart, checkout, cms)
- Migrate public templates to modules (billing, marketplace, cms)
- Keep shared templates in app/templates/ (base.html, errors/, partials/, macros/)
- Migrate letzshop partials to marketplace module

Static Files Migration:
- Migrate admin JS to modules: tenancy (23 files), core (5 files), monitoring (1 file)
- Migrate vendor JS to modules: tenancy (4 files), core (2 files)
- Migrate shared JS: vendor-selector.js to core, media-picker.js to cms
- Migrate storefront JS: storefront-layout.js to core
- Keep framework JS in static/ (api-client, utils, money, icons, log-config, lib/)
- Update all template references to use module_static paths

Naming Consistency:
- Rename static/platform/ to static/public/
- Rename app/templates/platform/ to app/templates/public/
- Update all extends and static references

Documentation:
- Update module-system.md with shared templates documentation
- Update frontend-structure.md with new module JS organization

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

docs/architecture/frontend-structure.md

@@ -50,8 +50,8 @@ app/
 **Purpose:** Public-facing platform pages (marketing, info pages)
 
 **Location:**
-- Templates: `app/templates/platform/`
-- Static: `static/platform/`
+- Templates: `app/templates/public/`
+- Static: `static/public/`
 
 **Pages:**
 - Homepage (multiple layouts: default, minimal, modern)
@@ -163,7 +163,7 @@ app/
 
 Each frontend has its own static directory for frontend-specific assets. Use the appropriate directory based on which frontend the asset belongs to.
 
-### Platform Static Assets (`static/platform/`)
+### Platform Static Assets (`static/public/`)
 
 **JavaScript Files:**
 ```html
@@ -270,7 +270,7 @@ Each frontend has its own static directory for frontend-specific assets. Use the
 Icon system (used by all 4 frontends) → static/shared/js/icons.js
 Admin dashboard chart → static/admin/js/charts.js
 Vendor product form → static/vendor/js/product-form.js
-Platform hero image → static/platform/img/hero.jpg
+Platform hero image → static/public/img/hero.jpg
 Storefront product carousel → static/storefront/js/carousel.js
 ```
 
@@ -338,31 +338,18 @@ app.mount("/static/modules/orders", StaticFiles(directory="app/modules/orders/st
 | **marketplace** | marketplace*.js, letzshop*.js | letzshop.js, marketplace.js, onboarding.js | - |
 | **monitoring** | monitoring.js, background-tasks.js, imports.js, logs.js | - | - |
 | **dev_tools** | testing-*.js, code-quality-*.js, icons-page.js, components.js | - | - |
-| **cms** | content-pages.js, content-page-edit.js | content-pages.js, content-page-edit.js, media.js | - |
+| **cms** | content-pages.js, content-page-edit.js | content-pages.js, content-page-edit.js, media.js | media-picker.js |
 | **analytics** | - | analytics.js | - |
+| **tenancy** | companies*.js, vendors*.js, platforms*.js, admin-users*.js, users*.js | login.js, team.js, profile.js, settings.js | - |
+| **core** | dashboard.js, settings.js, my-menu-config.js, login.js, init-alpine.js | dashboard.js, init-alpine.js | vendor-selector.js |
 
 ### Platform Static Files (Not in Modules)
 
-These files remain in `static/` because they're platform-level, not module-specific:
+Only framework-level files remain in `static/`:
 
-**Admin Core (`static/admin/js/`):**
-- `init-alpine.js` - Admin layout initialization
-- `dashboard.js` - Main admin dashboard
-- `login.js` - Admin authentication
-- `platforms.js`, `platform-*.js` - Platform management (6 files)
-- `vendors.js`, `vendor-*.js` - Vendor management at platform level (6 files)
-- `companies.js`, `company-*.js` - Company management (3 files)
-- `admin-users.js`, `admin-user-*.js` - Admin user management (3 files)
-- `users.js`, `user-*.js` - Platform user management (4 files)
-- `settings.js` - Platform settings
-
-**Vendor Core (`static/vendor/js/`):**
-- `init-alpine.js` - Vendor layout initialization
-- `dashboard.js` - Vendor main dashboard
-- `login.js` - Vendor authentication
-- `profile.js` - Vendor account settings
-- `settings.js` - Vendor configuration
-- `team.js` - Team member management
+**Admin Framework (`static/admin/js/`):**
+- `module-config.js` - Module system configuration UI
+- `module-info.js` - Module information display
 
 **Shared Utilities (`static/shared/js/`):**
 - `api-client.js` - Core HTTP client with auth
@@ -370,8 +357,7 @@ These files remain in `static/` because they're platform-level, not module-speci
 - `money.js` - Money/currency handling
 - `icons.js` - Heroicons SVG definitions
 - `log-config.js` - Centralized logging
-- `vendor-selector.js` - Vendor autocomplete component
-- `media-picker.js` - Media picker component
+- `lib/` - Third-party libraries (Alpine.js, Chart.js, etc.)
 
 ### User Type Distinction
 
@@ -379,13 +365,13 @@ The codebase distinguishes between three types of users:
 
 | Type | Management JS | Location | Description |
 |------|---------------|----------|-------------|
-| **Admin Users** | admin-users.js | `static/admin/js/` | Platform administrators (super admins, platform admins) |
-| **Platform Users** | users.js | `static/admin/js/` | Vendor/company users who log into the platform |
+| **Admin Users** | admin-users.js | `app/modules/tenancy/static/admin/js/` | Platform administrators (super admins, platform admins) |
+| **Platform Users** | users.js | `app/modules/tenancy/static/admin/js/` | Vendor/company users who log into the platform |
 | **Shop Customers** | customers.js | `app/modules/customers/static/` | End customers who buy from vendors |
 
-This distinction is important:
-- `admin-users.js` and `users.js` manage **internal platform users** → Stay in `static/admin/js/`
-- `customers.js` manages **storefront customers** → Lives in the customers module
+All user management JS is now in self-contained modules:
+- `admin-users.js` and `users.js` are in the **tenancy** module (manages platform users)
+- `customers.js` is in the **customers** module (manages storefront customers)
 
 ---
 
@@ -466,7 +452,7 @@ All frontends communicate with backend via APIs:
 - `/api/v1/admin/*` - Admin APIs
 - `/api/v1/vendor/*` - Vendor APIs
 - `/api/v1/storefront/*` - Storefront APIs
-- `/api/v1/platform/*` - Platform APIs
+- `/api/v1/public/*` - Platform APIs
 
 **Benefits:**
 - Clear backend contracts