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/test_routers/test_tool_definitions.py

@@ -6,7 +6,11 @@ from httpx import AsyncClient
 async def test_tool_definition_crud(auth_client: AsyncClient) -> None:
     resp = await auth_client.post(
         "/api/v1/tool-definitions",
-        json={"key": "runfusion", "name": "RunFusion", "image": "runfusion:latest"},
+        json={
+            "key": "opencode",
+            "name": "OpenCode",
+            "image": "ghcr.io/opencode-ai/opencode:latest",
+        },
     )
     assert resp.status_code == 201
     td_id = resp.json()["id"]
@@ -18,9 +22,9 @@ async def test_tool_definition_crud(auth_client: AsyncClient) -> None:
     resp = await auth_client.get(f"/api/v1/tool-definitions/{td_id}")
     assert resp.status_code == 200
 
-    resp = await auth_client.put(f"/api/v1/tool-definitions/{td_id}", json={"name": "RunFusionV2"})
+    resp = await auth_client.put(f"/api/v1/tool-definitions/{td_id}", json={"name": "OpenCodeV2"})
     assert resp.status_code == 200
-    assert resp.json()["name"] == "RunFusionV2"
+    assert resp.json()["name"] == "OpenCodeV2"
 
     resp = await auth_client.delete(f"/api/v1/tool-definitions/{td_id}")
     assert resp.status_code == 204