fix: Windows 下子进程 python3 命令不存在的问题

Windows 上没有 python3 命令，只有 python。使用 sys.executable
作为当前 Python 可执行文件路径，兼容 Windows 和 Linux/Mac。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

deploy.py

@@ -32,6 +32,9 @@ if hasattr(sys.stdout, 'buffer'):
     sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace', line_buffering=True)
     sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8', errors='replace', line_buffering=True)
 
+# 当前 Python 可执行文件（Windows 用 python.exe，Linux/Mac 用 python3）
+PYTHON = sys.executable
+
 # ============================================================================
 # 配置
 # ============================================================================
@@ -212,7 +215,7 @@ def deploy_backend():
 
     log_info("执行后端部署...")
     ok, _, err = run_command(
-        "python3 deploy.py remote",
+        f"{PYTHON} deploy.py remote",
         cwd=str(PROJECT_DIR / "backend-single"),
         timeout=600,
         capture=False
@@ -240,7 +243,7 @@ def deploy_frontend():
 
     log_info("执行前端部署...")
     ok, _, err = run_command(
-        "python3 deploy.py",
+        f"{PYTHON} deploy.py",
         cwd=str(PROJECT_DIR / "web"),
         timeout=600,
         capture=False
@@ -268,7 +271,7 @@ def deploy_admin():
 
     log_info("执行管理后台部署...")
     ok, _, err = run_command(
-        "python3 deploy.py",
+        f"{PYTHON} deploy.py",
         cwd=str(PROJECT_DIR / "web-admin"),
         timeout=600,
         capture=False
@@ -296,7 +299,7 @@ def deploy_life_script():
 
     log_info("执行 Life-Script 部署...")
     ok, _, err = run_command(
-        "python3 deploy.py",
+        f"{PYTHON} deploy.py",
         cwd=str(PROJECT_DIR / "life-script"),
         timeout=600,
         capture=False