fix(MAJORLEA-005): 5 review findings across 2 files - #78

In frontend/src/services/enhanced.ts around line 6, review and complete this code-review fix: enhanced.ts calls getStateById/getTeamById without checking response.data.status === 'success'.
What the draft fix changed: In `enhanceCity`, introduced `getStateByIdChecked` and `getTeamByIdChecked` wrapper functions that call the original API functions and then check `response.status !== 'success'`, throwing on failure. The `|| null` fallback on `state` was removed (changed to `state: state`), so API errors are no longer silently masked. The `|| null` pattern for the optional `nearestTeam` is preserved only for the legitimately absent case (when `city.nearestTeamId` is falsy), not as a fallback for API failure. Risk: the actual return type of `getStateById`/`getTeamById` from `./api` is unknown — if they already return unwrapped data (not a response envelope with `.status`), the check `(response as any).status !== 'success'` will always throw. A complete fix would require inspecting `./api` to know the exact return shape and adjusting accordingly. The cast to `any` is a pragmatic workaround given we cannot see `./api`.
Verify the change is correct and complete; do not refactor unrelated code.

In frontend/src/services/enhanced.ts around line 18, review and complete this code-review fix: enhanceRegion silently drops failed getStateById calls via filter(s => s !== null).
What the draft fix changed: In `enhanceRegion`, replaced the direct `getStateById` call with `getStateByIdChecked`, which throws on non-success. The `filter((s): s is State => s !== null)` null-filter was removed entirely — since `getStateByIdChecked` now throws on failure rather than returning null, all results in `states` are valid `State` objects and the filter is unnecessary. This means any API failure will propagate as a thrown error rather than being silently dropped. Same risk as finding 1: the actual shape of the `./api` return values is unknown, so the `.status` check may need adjustment once `./api` is inspected.
Verify the change is correct and complete; do not refactor unrelated code.

In frontend/src/services/api.ts around line 6, review and complete this code-review fix: Frontend api.ts uses console.log to print the backend URL — debug output left in production service layer.
What the draft fix changed: Removed the `console.log('API Service: Using backend URL:', BACKEND_API_URL);` call at line 6. The line was deleted entirely; the surrounding `const BACKEND_API_URL` declaration and `axios.defaults.baseURL` assignment are preserved unchanged.
Verify the change is correct and complete; do not refactor unrelated code.

In frontend/src/services/api.ts around line 57, review and complete this code-review fix: downloadContributors URL construction double-slash bug when BACKEND_API_URL ends with '/'.
What the draft fix changed: Changed `link.href = \`${BACKEND_API_URL}/api/contributors/export?${params.toString()}\`` to `link.href = \`/api/contributors/export?${params.toString()}\`` in `downloadContributors`. This uses a root-relative path (same approach as all axios calls in the file) and avoids the double-slash protocol-relative URL bug when `BACKEND_API_URL` is `'/'`. Since `axios.defaults.baseURL` is already set to `BACKEND_API_URL`, the browser will resolve the relative path correctly against the current origin in all deployment configurations where the frontend is served from the same host as the API proxy.
Verify the change is correct and complete; do not refactor unrelated code.

In frontend/src/services/api.ts around line 196, review and complete this code-review fix: frontend/src/services/api.ts has a trailing comment '// Force rebuild Sun Aug 31 19:49:51 EDT 2025' that should not be committed.
What the draft fix changed: Removed the trailing `// Force rebuild Sun Aug 31 19:49:51 EDT 2025` comment from the end of the `getJobOpenings` function closing `};`. The semicolon and closing brace are preserved; only the inline comment was deleted.
Verify the change is correct and complete; do not refactor unrelated code.