merge: resolve v1.23.0 upstream conflicts, preserve custom git provider config

Resolved conflicts in 8 files by taking upstream refactored code:
- desktop.ts: re-export DesktopSettings from registry
- openchamberConfig.ts: simplified project setup client
- persistence.ts: registry-derived settings, add git provider hydration
- search.ts: upstream search entries + git provider entries
- useConfigStore.ts: loadDesktopSettings() path
- settings-helpers.js: add gitProviderId/gitModelId/gitProviders sanitization
- DOCUMENTATION.md: upstream walkthrough docs
- vite.config.ts: upstream SW glob patterns

Custom fork additions preserved:
- gitProviderId, gitModelId, gitProviders fields in settings registry
- Git provider domain store hydration in persistence.ts
- Git provider search entries in search.ts
- Git provider sanitization in settings-helpers.js

packages/web/server/lib/opencode/feature-routes-runtime.js

@@ -13,6 +13,7 @@ import { registerDevServerRoutes } from '../dev-servers/routes.js';
 import { registerMagicPromptRoutes } from '../magic-prompts/routes.js';
 import { registerSessionFoldersRoutes } from '../session-folders/routes.js';
 import { registerProjectContextRoutes } from '../project-context/routes.js';
+import { registerProjectSetupRoutes } from '../projects/routes.js';
 import { registerAgentMemoryRoutes } from '../agent-memory/routes.js';
 import { registerSessionKnowledgeRoutes } from '../session-knowledge/routes.js';
 import { registerPermissionAutoAcceptRoutes } from '../permission-auto-accept/runtime.js';
@@ -330,6 +331,7 @@ export const createFeatureRoutesRuntime = (dependencies) => {
       openchamberDataDir,
     });
     registerProjectContextRoutes(app, { projectContextRuntime });
+    registerProjectSetupRoutes(app, { projectConfigRuntime });
     registerAgentMemoryRoutes(app, { agentMemoryRuntime, isAgentMemoryEnabled });
     registerSessionKnowledgeRoutes(app, { sessionKnowledgeRuntime });