fix: address all review findings on PR #14

- gitea.Client: add concurrency safety doc comment
- gitea.Client: set 30s HTTP client timeout as safety net
- llm.Client: add concurrency safety doc comment
- llm.Client: set 2min HTTP client timeout (LLM calls are slow)
- gitea/client.go: gofmt to fix indentation
- integration_test: update to current BuildSystemPrompt/BuildUserPrompt signatures
- integration_test: use strings.SplitN for owner/repo parsing

integration_test.go

@@ -74,8 +74,8 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 	t.Logf("Diff size: %d bytes", len(diff))
 
 	// Step 3: Build prompts
-	systemPrompt := review.BuildSystemPrompt("")
-	userPrompt := review.BuildUserPrompt(pr.Title, pr.Body, diff, true, "")
+	systemPrompt := review.BuildSystemPrompt("", "")
+	userPrompt := review.BuildUserPrompt(pr.Title, pr.Body, diff, "", true, "")
 
 	// Step 4: Call LLM
 	llmClient := llm.NewClient(llmBaseURL, llmAPIKey, llmModel)