Reset OpenCode user config to defaults

app.py

@@ -383,6 +383,27 @@ async def install_opencode():
         log.warning("⚠️ opencode 安裝失敗或已存在: %s", err[-500:])
 
 
+def reset_opencode_config():
+    """移除 OpenCode 使用者設定，令安裝使用內建預設值。"""
+    xdg_config = os.environ.get("XDG_CONFIG_HOME", os.path.join(HOME, ".config"))
+    config_files = [
+        os.path.join(xdg_config, "opencode", "opencode.json"),
+        os.path.join(xdg_config, "opencode", "opencode.jsonc"),
+        os.path.join(xdg_config, "opencode", "opencode.json5"),
+        os.path.join(HOME, ".opencode", "opencode.json"),
+        os.path.join(HOME, ".opencode", "opencode.jsonc"),
+        os.path.join(HOME, ".opencode", "opencode.json5"),
+    ]
+    for path in config_files:
+        try:
+            os.remove(path)
+            log.info("Removed OpenCode config to restore defaults: %s", path)
+        except FileNotFoundError:
+            pass
+        except OSError as exc:
+            log.warning("Could not remove OpenCode config %s: %s", path, exc)
+
+
 async def install_editors():
     """安裝 vim / neovim（選用）。"""
     log.info("正在安裝 vim / neovim ...")
@@ -438,8 +459,9 @@ def dummy_gpu():
 @app.on_event("startup")
 async def startup_event():
     dummy_gpu()
-    # 依序執行：安裝 opencode → 執行 installpi.sh → 安裝編輯器（背景）
+    # 安裝 OpenCode 後清除使用者層級設定，使用 OpenCode 預設值。
     await install_opencode()
+    reset_opencode_config()
     #await run_installpi_script()
     # 安裝編輯器不影響主要流程，放背景執行
     asyncio.create_task(install_editors())