Improve config lookup and OpenAI streaming decode

internal/storage/storage.go

@@ -87,20 +87,26 @@ func resolvePath(cfg config.StorageConfig) (string, error) {
 		return cfg.Path, nil
 	}
 
-	username := cfg.Username
-	if username == "" {
-		username = os.Getenv("USER")
-		if username == "" {
-			username = "default"
+	baseDir := strings.TrimSpace(cfg.BaseDir)
+	if baseDir == "" {
+		home, err := os.UserHomeDir()
+		if err == nil && strings.TrimSpace(home) != "" {
+			baseDir = filepath.Join(home, ".local", "share", "goaichat")
 		}
 	}
 
-	base := filepath.Join("/var/log/goaichat", username)
-	if cfg.BaseDir != "" {
-		base = cfg.BaseDir
+	if baseDir == "" {
+		username := strings.TrimSpace(cfg.Username)
+		if username == "" {
+			username = strings.TrimSpace(os.Getenv("USER"))
+			if username == "" {
+				username = "default"
+			}
+		}
+		baseDir = filepath.Join(os.TempDir(), "goaichat", username)
 	}
 
-	return filepath.Join(base, "goaichat.db"), nil
+	return filepath.Join(baseDir, "goaichat.db"), nil
 }
 
 func ensureDir(dir string) error {