feat: workspace-first UI refresh - PR-1 backend endpoints

- Add FileService for workspace-scoped file operations
- Add GitOperations service for workspace-scoped git commands
- Add workspace_files API: GET/POST /workspaces/{id}/files
- Add workspace_git API: status, branches, commit, push, pull, fetch, checkout, history
- Add workspace_instances API: list instances per workspace
- Add top-level POST /workspaces/ (accepts repo_id directly)
- Enrich GET /projects/ with nested repositories and workspaces
- Register all new routers in main.py
- 23 tests passing (17 existing + 6 new)

Quality gates: ruff clean

apps/web/src/pages/workspaces.tsx

@@ -13,7 +13,10 @@ import type { Workspace } from "../types/workspace";
 export function WorkspacesPage() {
 	const [showCreate, setShowCreate] = useState(false);
 	const [startWorkspace, setStartWorkspace] = useState<Workspace | null>(null);
-	const [createTarget, setCreateTarget] = useState<{ projectId: string; repoId: string } | null>(null);
+	const [createTarget, setCreateTarget] = useState<{
+		projectId: string;
+		repoId: string;
+	} | null>(null);
 
 	const { workspaces, loading, error, refresh } = useWorkspaces();
 	const actions = useWorkspaceActions();
@@ -27,11 +30,21 @@ export function WorkspacesPage() {
 	};
 
 	const handleDelete = async (workspace: Workspace) => {
-		await actions.delete(workspace.project_id, workspace.repo_id, workspace, refresh);
+		await actions.delete(
+			workspace.project_id,
+			workspace.repo_id,
+			workspace,
+			refresh,
+		);
 	};
 
 	const handleSync = async (workspace: Workspace) => {
-		await actions.sync(workspace.project_id, workspace.repo_id, workspace, refresh);
+		await actions.sync(
+			workspace.project_id,
+			workspace.repo_id,
+			workspace,
+			refresh,
+		);
 	};
 
 	const handleStartTool = async (
@@ -52,7 +65,12 @@ export function WorkspacesPage() {
 				[],
 				startWorkspace.id,
 			);
-			await startInstance(startWorkspace.project_id, startWorkspace.repo_id, instance.id, configProfileId);
+			await startInstance(
+				startWorkspace.project_id,
+				startWorkspace.repo_id,
+				instance.id,
+				configProfileId,
+			);
 			setStartWorkspace(null);
 			await refresh();
 		} catch (err) {
@@ -72,20 +90,23 @@ export function WorkspacesPage() {
 					>
 						<Icon name="refresh" size="sm" />
 					</button>
-				<button
-					className="btn btn-primary"
-					onClick={() => {
-						if (workspaces.length > 0) {
-							const first = workspaces[0];
-							setCreateTarget({ projectId: first.project_id, repoId: first.repo_id });
-							setShowCreate(true);
-						} else {
-							alert("Navigate to a project to create your first workspace.");
-						}
-					}}
-				>
-					<Icon name="add" size="sm" /> New Workspace
-				</button>
+					<button
+						className="btn btn-primary"
+						onClick={() => {
+							if (workspaces.length > 0) {
+								const first = workspaces[0];
+								setCreateTarget({
+									projectId: first.project_id,
+									repoId: first.repo_id,
+								});
+								setShowCreate(true);
+							} else {
+								alert("Navigate to a project to create your first workspace.");
+							}
+						}}
+					>
+						<Icon name="add" size="sm" /> New Workspace
+					</button>
 				</div>
 			</header>
 
@@ -96,7 +117,10 @@ export function WorkspacesPage() {
 					projectId={createTarget.projectId}
 					repoId={createTarget.repoId}
 					onSubmit={handleCreate}
-					onCancel={() => { setShowCreate(false); setCreateTarget(null); }}
+					onCancel={() => {
+						setShowCreate(false);
+						setCreateTarget(null);
+					}}
 				/>
 			)}