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

llm/client.go

@@ -8,9 +8,11 @@ import (
 	"io"
 	"net/http"
 	"strings"
+	"time"
 )
 
 // Client calls an OpenAI-compatible chat completion API.
+// A Client is safe for concurrent use by multiple goroutines after construction.
 type Client struct {
 	baseURL     string
 	apiKey      string
@@ -25,7 +27,7 @@ func NewClient(baseURL, apiKey, model string) *Client {
 		baseURL: strings.TrimRight(baseURL, "/"),
 		apiKey:  apiKey,
 		model:   model,
-		http:    &http.Client{},
+		http:    &http.Client{Timeout: 2 * time.Minute},
 	}
 }