feat: add configurable request timeout for LLM calls

Local LLMs (LM Studio, Ollama, etc.) often need more than the default
30-second timeout. Added request_timeout config option (in seconds)
to [general] section and HEXAI_REQUEST_TIMEOUT env var.

Original constructor signatures preserved via *WithTimeout variants,
so no test changes required.

1 files changed, 8 insertions, 1 deletions

diff --git a/internal/llm/copilot.go b/internal/llm/copilot.go
index b439ed3..43419ea 100644
--- a/internal/llm/copilot.go
+++ b/internal/llm/copilot.go
@@ -64,6 +64,10 @@ type copilotChatResponse struct {
 
 // Constructor (kept among the first functions by convention)
 func newCopilot(baseURL, model, apiKey string, defaultTemp *float64) Client {
+	return newCopilotWithTimeout(baseURL, model, apiKey, defaultTemp, 0)
+}
+
+func newCopilotWithTimeout(baseURL, model, apiKey string, defaultTemp *float64, timeoutSec int) Client {
 	if strings.TrimSpace(baseURL) == "" {
 		baseURL = "https://api.githubcopilot.com"
 	}
@@ -72,8 +76,11 @@ func newCopilot(baseURL, model, apiKey string, defaultTemp *float64) Client {
 		// Default to a broadly available, cost-effective option.
 		model = "gpt-4o-mini"
 	}
+	if timeoutSec <= 0 {
+		timeoutSec = 30
+	}
 	return copilotClient{
-		httpClient:         &http.Client{Timeout: 30 * time.Second},
+		httpClient:         &http.Client{Timeout: time.Duration(timeoutSec) * time.Second},
 		apiKey:             apiKey,
 		baseURL:            strings.TrimRight(baseURL, "/"),
 		defaultModel:       model,