Fix/claude code plugin schema (#22271)

* fix: add missing LiteLLM_ClaudeCodePluginTable to schema.prisma

- Claude Code Plugin Marketplace endpoints (/claude-code/marketplace.json,
  /claude-code/plugins) were returning 500 errors because
  LiteLLM_ClaudeCodePluginTable model was missing from both schema.prisma files
- Prisma client was generated without this table causing AttributeError:
  'Prisma' object has no attribute 'litellm_claudecodeplugintable'
- Added missing model definition to root schema.prisma and
  litellm/proxy/schema.prisma

Fixes #21310

* test: add regression test for LiteLLM_ClaudeCodePluginTable schema

* fix: address greptile review - add @updatedAt, clean up test imports

litellm/proxy/schema.prisma

@@ -1096,4 +1096,19 @@ model LiteLLM_AccessGroupTable {
   created_by         String?
   updated_at         DateTime @default(now()) @updatedAt
   updated_by         String?
-}
+}
+// Claude Code Plugin Marketplace table
+model LiteLLM_ClaudeCodePluginTable {
+  id            String    @id @default(uuid())
+  name          String    @unique
+  version       String?
+  description   String?
+  manifest_json String?
+  files_json    String?   @default("{}")
+  enabled       Boolean   @default(true)
+  created_at    DateTime? @default(now())
+  updated_at    DateTime? @default(now()) @updatedAt
+  created_by    String?
+
+  @@map("LiteLLM_ClaudeCodePluginTable")
+}

schema.prisma

@@ -1095,4 +1095,19 @@ model LiteLLM_AccessGroupTable {
   created_by         String?
   updated_at         DateTime @default(now()) @updatedAt
   updated_by         String?
-}
+}
+// Claude Code Plugin Marketplace table
+model LiteLLM_ClaudeCodePluginTable {
+  id            String    @id @default(uuid())
+  name          String    @unique
+  version       String?
+  description   String?
+  manifest_json String?
+  files_json    String?   @default("{}")
+  enabled       Boolean   @default(true)
+  created_at    DateTime? @default(now())
+  updated_at    DateTime? @default(now()) @updatedAt
+  created_by    String?
+
+  @@map("LiteLLM_ClaudeCodePluginTable")
+}

tests/litellm/proxy/test_claude_code_marketplace.py

@@ -0,0 +1,18 @@
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_claude_code_plugin_table_schema_exists():
+
+    with open("schema.prisma", "r") as f:
+        schema = f.read()
+    assert "LiteLLM_ClaudeCodePluginTable" in schema, (
+        "LiteLLM_ClaudeCodePluginTable model missing from schema.prisma - "
+        "this causes AttributeError on all /claude-code/plugins endpoints"
+    )
+
+    with open("litellm/proxy/schema.prisma", "r") as f:
+        proxy_schema = f.read()
+    assert "LiteLLM_ClaudeCodePluginTable" in proxy_schema, (
+        "LiteLLM_ClaudeCodePluginTable model missing from litellm/proxy/schema.prisma"
+    )