feat(config): support multiple Gitea profiles via GITEA_PROFILE env var

未設時讀 config.env（行為不變）；設了讀 config.<profile>.env。
.gitignore 新增 config.*.env 但保留 config.example.env。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/lib/common.sh

@@ -12,7 +12,12 @@ set -euo pipefail
 
 _LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 _SKILL_DIR="$(cd "${_LIB_DIR}/../.." && pwd)"
-CONFIG_FILE="${_SKILL_DIR}/config.env"
+# GITEA_PROFILE 未設 → 讀 config.env；設了 → 讀 config.<profile>.env
+if [[ -n "${GITEA_PROFILE:-}" ]]; then
+    CONFIG_FILE="${_SKILL_DIR}/config.${GITEA_PROFILE}.env"
+else
+    CONFIG_FILE="${_SKILL_DIR}/config.env"
+fi
 
 GITEA_API_RESP_FILE=""
 _cleanup_common() {
@@ -52,6 +57,10 @@ load_config() {
             echo "  cp ${_SKILL_DIR}/config.example.env ${CONFIG_FILE}"
             echo ""
             echo "然後編輯 ${CONFIG_FILE} 填入 GITEA_URL / GITEA_USER / GITEA_TOKEN"
+            if [[ -n "${GITEA_PROFILE:-}" ]]; then
+                echo ""
+                echo "（目前使用 profile：${GITEA_PROFILE}）"
+            fi
         } >&2
         exit 1
     fi