diff --git a/scripts/util/platforms.py b/scripts/util/platforms.py
index d34ead1..e60b89f 100644
--- a/scripts/util/platforms.py
+++ b/scripts/util/platforms.py
@@ -200,6 +200,89 @@ PLATFORMS: dict[str, dict[str, Any]] = {
         "aliases": ["公众号", "微信", "微信公众号"],
         "capabilities": {"web": True, "api_key": False, "rpa": False},
     },
+    # =========================================================================
+    # Aligned with db.platform_defaults.PLATFORM_DEFAULT_AUTH_STRATEGY keys
+    # =========================================================================
+    "douyin": {
+        "display_name": "抖音",
+        "domain": "content",
+        "provider_code": "douyin",
+        "default_url": "https://www.douyin.com",
+        "aliases": ["抖音", "Douyin"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "wechat_mp": {
+        "display_name": "微信公众号",
+        "domain": "content",
+        "provider_code": "wechat_mp",
+        "default_url": "https://mp.weixin.qq.com",
+        "aliases": ["微信公众号", "公众号", "WeChat MP"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "xiaohongshu": {
+        "display_name": "小红书",
+        "domain": "content",
+        "provider_code": "xiaohongshu",
+        "default_url": "https://www.xiaohongshu.com",
+        "aliases": ["小红书", "Xiaohongshu", "RED"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "bilibili": {
+        "display_name": "哔哩哔哩",
+        "domain": "content",
+        "provider_code": "bilibili",
+        "default_url": "https://www.bilibili.com",
+        "aliases": ["B站", "哔哩哔哩", "Bilibili"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "github": {
+        "display_name": "GitHub",
+        "domain": "dev",
+        "provider_code": "github",
+        "default_url": "https://github.com/login",
+        "aliases": ["GitHub", "github"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "aws": {
+        "display_name": "AWS",
+        "domain": "dev",
+        "provider_code": "aws",
+        "default_url": "https://console.aws.amazon.com",
+        "aliases": ["AWS", "Amazon Web Services", "亚马逊云"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "gcp": {
+        "display_name": "GCP",
+        "domain": "dev",
+        "provider_code": "gcp",
+        "default_url": "https://console.cloud.google.com",
+        "aliases": ["GCP", "Google Cloud", "谷歌云"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "icbc_sim": {
+        "display_name": "工行仿真",
+        "domain": "sim",
+        "provider_code": "icbc_sim",
+        "default_url": "http://localhost:5180",
+        "aliases": ["工行仿真", "ICBC Simulator", "ICBC SIM"],
+        "capabilities": {"web": True, "api_key": False, "rpa": False},
+    },
+    "openai": {
+        "display_name": "OpenAI API",
+        "domain": "llm",
+        "provider_code": "openai",
+        "default_url": "https://platform.openai.com",
+        "aliases": ["OpenAI", "openai", "GPT", "ChatGPT API"],
+        "capabilities": {"web": False, "api_key": True, "rpa": False},
+    },
+    "anthropic": {
+        "display_name": "Anthropic",
+        "domain": "llm",
+        "provider_code": "anthropic",
+        "default_url": "https://console.anthropic.com",
+        "aliases": ["Anthropic", "anthropic", "Claude API"],
+        "capabilities": {"web": False, "api_key": True, "rpa": False},
+    },
 }
 
 # ---------------------------------------------------------------------------
diff --git a/tests/test_platform_alignment.py b/tests/test_platform_alignment.py
new file mode 100644
index 0000000..1d1bebf
--- /dev/null
+++ b/tests/test_platform_alignment.py
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+"""Contract tests: PLATFORM_DEFAULT_AUTH_STRATEGY keys must resolve via PLATFORMS."""
+from db.platform_defaults import PLATFORM_DEFAULT_AUTH_STRATEGY
+from util.platforms import resolve_platform_key
+
+
+def test_platform_defaults_all_resolvable():
+    for key in PLATFORM_DEFAULT_AUTH_STRATEGY:
+        assert resolve_platform_key(key) == key
+
+
+def test_new_platform_aliases_work():
+    assert resolve_platform_key("抖音") == "douyin"
+    assert resolve_platform_key("douyin") == "douyin"
+    assert resolve_platform_key("GitHub") == "github"
+    assert resolve_platform_key("github") == "github"
+    assert resolve_platform_key("OpenAI") == "openai"
+    assert resolve_platform_key("openai") == "openai"