fix: add init-db CLI for host install/upgrade metadata seed

tests/test_usage.py

@@ -23,6 +23,7 @@ def test_usage_includes_all_account_subcommands():
     assert r.returncode == 1
     usage = r.stdout
     for cmd in (
+        "init-db",
         "init-master-key",
         "export-credentials",
         "import-credentials",
@@ -35,3 +36,44 @@ def test_usage_includes_all_account_subcommands():
         assert cmd in usage, f"USAGE 缺少 {cmd}"
     assert "--ensure" in usage
     assert "--login-id" in usage
+
+
+def test_init_db_cli_succeeds(fake_env):
+    """宿主调用的 init-db 必须成功并写入展示元数据。"""
+    import json
+
+    env = {
+        **os.environ,
+        "PYTHONPATH": _scripts,
+        "JIANGCHANG_DATA_ROOT": fake_env["data_root"],
+        "JIANGCHANG_USER_ID": fake_env["user_id"],
+    }
+    r = subprocess.run(
+        [sys.executable, "main.py", "init-db"],
+        capture_output=True,
+        text=True,
+        env=env,
+        cwd=_scripts,
+    )
+    assert r.returncode == 0, r.stdout + r.stderr
+    payload = json.loads(r.stdout.strip().splitlines()[-1])
+    assert payload.get("ok") is True
+    assert payload.get("skill") == "account-manager"
+    assert payload.get("db_path")
+
+    from db.connection import get_conn
+
+    conn = get_conn()
+    try:
+        cur = conn.cursor()
+        cur.execute("SELECT COUNT(*) FROM _jiangchang_columns")
+        assert int(cur.fetchone()[0]) > 0
+        cur.execute(
+            """
+            SELECT display_name FROM _jiangchang_columns
+            WHERE table_name = 'accounts' AND column_name = 'role'
+            """
+        )
+        assert cur.fetchone()[0] == "角色"
+    finally:
+        conn.close()