chore: add frontend dependencies and update test fixtures

- Add react-router-dom, @tanstack/react-query, zustand, @headlessui/react
- Update pnpm workspace configuration
- Update test fixtures to reference OpenCode instead of RunFusion
- Add frontend environment variable examples
- Update .gitignore for .opencode and .sisyphus directories

apps/api/tests/tools/test_router.py

@@ -27,7 +27,7 @@ def test_list_tools_includes_builtins() -> None:
     assert response.status_code == 200
     data = response.json()
     ids = {item["id"] for item in data}
-    assert "runfusion" in ids
+    assert "opencode" in ids
     assert "code-server" in ids
 
 
@@ -36,12 +36,12 @@ def test_list_tools_includes_builtins() -> None:
 # ---------------------------------------------------------------------------
 
 
-def test_get_tool_runfusion() -> None:
-    response = client.get("/api/v1/tools/runfusion")
+def test_get_tool_opencode() -> None:
+    response = client.get("/api/v1/tools/opencode")
     assert response.status_code == 200
     data = response.json()
-    assert data["id"] == "runfusion"
-    assert data["name"] == "RunFusion"
+    assert data["id"] == "opencode"
+    assert data["name"] == "OpenCode"
 
 
 def test_get_tool_not_found() -> None:
@@ -71,7 +71,7 @@ def test_create_tool_success() -> None:
 
 def test_create_tool_duplicate() -> None:
     payload = {
-        "id": "runfusion",
+        "id": "opencode",
         "name": "Duplicate",
         "image": "dup:latest",
         "ports": [{"container_port": 3000, "primary": True}],