Simplify workspace creation with inline worktree API

Replace the multi-step new-agent route flow with a single
create_paseo_worktree endpoint that registers the workspace immediately
and creates the git worktree in the background. The sidebar now calls
this endpoint directly and shows a creating spinner inline.

Also auto-resolves the base branch from origin/HEAD when not explicitly
provided, removes the unused Tauri WebSocket transport layer, and
normalizes loopback endpoints to localhost.

Closes #125

packages/server/src/client/daemon-client.ts

@@ -213,6 +213,10 @@ type BranchSuggestionsPayload = BranchSuggestionsResponse['payload']
 type DirectorySuggestionsPayload = DirectorySuggestionsResponse['payload']
 type PaseoWorktreeListPayload = PaseoWorktreeListResponse['payload']
 type PaseoWorktreeArchivePayload = PaseoWorktreeArchiveResponse['payload']
+type CreatePaseoWorktreePayload = Extract<
+  SessionOutboundMessage,
+  { type: 'create_paseo_worktree_response' }
+>['payload']
 type FileExplorerPayload = FileExplorerResponse['payload']
 type FileDownloadTokenPayload = FileDownloadTokenResponse['payload']
 type ListProviderModelsPayload = ListProviderModelsResponseMessage['payload']
@@ -2148,6 +2152,22 @@ export class DaemonClient {
     })
   }
 
+  async createPaseoWorktree(
+    input: { cwd: string; worktreeSlug?: string },
+    requestId?: string
+  ): Promise<CreatePaseoWorktreePayload> {
+    return this.sendCorrelatedSessionRequest({
+      requestId,
+      message: {
+        type: 'create_paseo_worktree_request',
+        cwd: input.cwd,
+        worktreeSlug: input.worktreeSlug,
+      },
+      responseType: 'create_paseo_worktree_response',
+      timeout: 60000,
+    })
+  }
+
   async validateBranch(
     options: { cwd: string; branchName: string },
     requestId?: string