feat: Add Loot Manager plugin skeleton (Phase 4)

Created skeleton implementation for first paid module ($9.99).

Plugin Features:
- Loot profile system with container multipliers and custom loot tables
- OnLootSpawn/OnEntitySpawned hooks for container loot modification
- Six container types: normal, elite, mine, barrel, food, military
- Chat command: /loot.profile [name] for admin profile switching
- Per-item config: shortname, min/max amount, spawn chance, skin ID

Status:
- Hooks functional, profile switching works via chat command
- Dashboard UI integration pending future iteration
- Auto-deploy system pending future iteration
- Migration 009 already includes module seed data

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

CHANGELOG.md

@@ -4,6 +4,74 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added (Phase 4 — Loot Manager Plugin Skeleton)
+
+**Plugin Skeleton:**
+- `plugin/modules/LootManager.cs` — First paid module (skeleton implementation)
+  - Configuration: Loot profiles with container multipliers + custom loot tables
+  - Hooks: `OnLootSpawn()` and `OnEntitySpawned()` for container loot modification
+  - Profile switching: Multiplier-based (2x, 5x, 10x) and full custom loot table support
+  - Container types: Normal crate, elite, mine, barrel, food, military, default fallback
+  - Chat command: `/loot.profile [name]` — In-game profile switching for admins
+  - Item support: Shortname, min/max amount, spawn chance, skin ID
+- `plugin/modules/README.md` — Module documentation
+  - Price: $9.99
+  - Features: Visual loot table editor (dashboard integration TBD), profile switching, skin support
+  - Installation: Auto-deploy via module store (implementation TBD)
+
+**Database:**
+- Migration 009 already includes Loot Manager seed data in `modules` table
+
+**Status:** Skeleton complete. Hooks functional. Profile switching works via chat command. Dashboard UI integration and deployment automation pending future iteration.
+
+### Added (Phase 4 — Module Store Frontend)
+
+**Frontend:**
+- Complete `ModuleStoreView.vue` implementation — Customer-facing module marketplace with:
+  - **Catalog Tab:**
+    - Module grid with preview images, prices, category badges, purchase status
+    - Search functionality (name/description)
+    - Category filter (Loot, Events, Economy, Kits, Admin, PVP, PVE, Building)
+    - Hover animations and professional card layout
+  - **My Modules Tab:**
+    - Purchased modules with installation status tracking
+    - "Install" button for purchased-but-not-installed modules
+    - Empty state prompting catalog browsing
+  - **Module Detail Modal:**
+    - Full-screen module preview with screenshots gallery
+    - Expanded description and complete features list
+    - Version display and pricing details
+    - Direct purchase/install CTA from modal
+  - **Purchase Confirmation Modal:**
+    - Shows module name, license binding, total price
+    - Error handling with inline error display
+    - Non-refundable disclaimer
+    - Processing state during purchase flow
+  - **Payment Flow:**
+    - Instant purchase confirmation (MVP)
+    - External payment URL redirect support (Stripe/PayPal)
+    - State refresh after successful purchase
+- TypeScript types (`types/index.ts`):
+  - `Module` interface with full marketplace metadata (id, slug, name, description, price, category, images, features, version, purchase/install status)
+  - `PurchaseRequest` interface for API integration
+- **API Integration:**
+  - `GET /api/modules/catalog` — Browse all available modules
+  - `GET /api/modules/my-modules` — Fetch purchased modules for current license
+  - `POST /api/modules/purchase` — Initiate module purchase (returns payment URL or instant confirmation)
+  - `POST /api/modules/install` — Trigger deployment to game server
+
+**Design Details:**
+- Professional marketplace UI using existing Tailwind patterns
+- Color-coded category badges (8 categories supported)
+- Preview image with hover scale effect
+- "Purchased" badge overlay on owned modules
+- Three-state purchase flow: Not Purchased → Purchased → Installed
+- Mobile-responsive grid (1/2/3 columns)
+- Empty states for zero results and zero purchases
+- Price display prominently in catalog cards and modals
+
+**Purpose:** Enables server admins to browse, preview, purchase, and install premium gameplay modules (Loot systems, Events, Economy plugins, Kits) directly from the dashboard. Customers pay real money here — UI polish critical.
+
 ### Added (Phase 2 — Alerting System)
 
 **Backend:**