fix: check Gitea API response status and fallback for PR reviews (#47)

## Summary
- Add HTTP response status checking to all Gitea tracker methods that were silently swallowing errors
- Add fallback in create_pr_review: if inline comments fail, retry as plain PR comment

## Test plan
- [ ] Deploy and trigger a PR review, check logs for actual error details
- [ ] Verify fallback posts summary comment when inline comments fail

Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Co-authored-by: Sharang Parnerkar <30073382+mighty840@users.noreply.github.com>
Reviewed-on: #47

Cargo.lock

@@ -4699,9 +4699,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.103.9"
+version = "0.103.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7df23109aa6c1567d1c575b9952556388da57401e4ace1d15f79eedad0d8f53"
+checksum = "df33b2b81ac578cabaf06b89b0631153a3f416b0a886e8a7a1707fb51abbd1ef"
 dependencies = [
  "ring",
  "rustls-pki-types",
@@ -5171,7 +5171,7 @@ version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c1c97747dbf44bb1ca44a561ece23508e99cb592e862f22222dcf42f51d1e451"
 dependencies = [
- "heck 0.5.0",
+ "heck 0.4.1",
  "proc-macro2",
  "quote",
  "syn",