feat: implement repository clone mode with SSH key support

- Add clone_mode and branch fields to tool_instances
- Add ssh_key_id to git_repositories for per-repo SSH key assignment
- Implement host-side git cloning with branch selection (default: main)
- Mount SSH keys into containers for git operations in clone mode
- Add dirty state check on clone-mode instance deletion with confirmation
- Update SessionsPage with mount/clone selector, branch input, SSH key display
- Add SSH key selector to repository creation form
- Add dirty delete confirmation modal with changed files list
- Update API schemas and endpoints for new fields
- Sync delta specs to main specs (git-repo, tool-instances, repo-clone-mode)
- Archive completed OpenSpec change: repo-clone-mode-with-ssh
- Document git requirement for custom tool types

Quality gates: Frontend typecheck and build passed
OpenSpec: repo-clone-mode-with-ssh archived with all tasks complete

apps/web/src/api/sessions.ts

@@ -27,6 +27,8 @@ export interface Session {
   url: string | null;
   container_status?: string;
   probe_status?: string;
+  clone_mode?: string;
+  branch?: string | null;
 }
 
 export async function listInstances(
@@ -43,13 +45,17 @@ export async function createInstance(
   projectId: string,
   repoId: string,
   toolTypeId: string,
-  displayName?: string
+  displayName?: string,
+  cloneMode?: string,
+  branch?: string
 ): Promise<ToolInstance> {
   const response = await apiClient.post(
     `/projects/${projectId}/repositories/${repoId}/instances`,
     {
       tool_type_id: toolTypeId,
       display_name: displayName,
+      clone_mode: cloneMode || "mount",
+      branch: branch || undefined,
     }
   );
   return response.data;
@@ -91,10 +97,12 @@ export async function restartInstance(
 export async function deleteInstance(
   projectId: string,
   repoId: string,
-  instanceId: string
+  instanceId: string,
+  force?: boolean
 ): Promise<void> {
   await apiClient.delete(
-    `/projects/${projectId}/repositories/${repoId}/instances/${instanceId}`
+    `/projects/${projectId}/repositories/${repoId}/instances/${instanceId}`,
+    { params: { force } }
   );
 }