feat: v3.1.0 — Live Platform Foundation (Track E.1-E.3)

Major release introducing the Live Platform architecture:

- SQLite database backend with async operations and migrations (E.1)
- AES-256-GCM credential encryption with HKDF key derivation (E.1)
- OAuth Social Login with GitHub and Google (E.2)
- Site management API with encrypted credential storage (E.3)
- Per-user MCP endpoints at /u/{user_id}/{alias}/mcp (E.3)
- User API keys with bcrypt hashing (E.3)
- Auto-generated config snippets for 5 MCP clients (E.3)
- Dashboard: dark/light mode, RBAC, My Sites, Connect page
- Active background health checks
- 452 tests (up from 303), all passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/run_integration_tests.py

@@ -100,8 +100,6 @@ class IntegrationTester:
             # Check handlers initialized
             assert hasattr(plugin, "posts"), "Missing posts handler"
             assert hasattr(plugin, "media"), "Missing media handler"
-            assert hasattr(plugin, "products"), "Missing products handler"
-            assert hasattr(plugin, "orders"), "Missing orders handler"
 
             self.add_result(
                 "wordpress_plugin_init", "passed", "WordPress plugin initializes correctly"
@@ -158,11 +156,6 @@ class IntegrationTester:
                 "CommentsHandler",
                 "UsersHandler",
                 "SiteHandler",
-                "ProductsHandler",
-                "OrdersHandler",
-                "CustomersHandler",
-                "ReportsHandler",
-                "CouponsHandler",
                 "SEOHandler",
                 "WPCLIHandler",
                 "MenusHandler",