feat: allow creating external repositories directly from git mount editor

- Add createExternalRepository API function
- Update GitMountEditor with "+ Add new repository..." option
- Show form to enter repo name and remote URL
- Auto-create external repo and refresh list on success
- Update config-profiles page to pass onCreateRepository handler

apps/web/src/pages/config-profiles.tsx

@@ -19,7 +19,7 @@ import {
   type ResolvedProfile,
 } from "../api/config_profiles";
 import { listProjects } from "../api/projects";
-import { listAllUserRepositories, type GitRepository } from "../api/git_repositories";
+import { listAllUserRepositories, createExternalRepository, type GitRepository } from "../api/git_repositories";
 import type { Project } from "../types";
 import { listToolTypes, type ToolType } from "../api/tool_types";
 import { GitMountEditor } from "../components/git-mount-editor";
@@ -1259,6 +1259,14 @@ export const ConfigProfilesPage = () => {
                   mounts={formData.git_mounts || []}
                   repositories={repositories}
                   onChange={(git_mounts) => updateFormField("git_mounts", git_mounts)}
+                  onCreateRepository={async (name, remoteUrl) => {
+                    const repo = await createExternalRepository({
+                      name,
+                      remote_url: remoteUrl,
+                    });
+                    setRepositories((prev) => [...prev, repo]);
+                    return repo;
+                  }}
                 />
               </div>