feat: Add App Center plugin functionality

schemas/plugins.py

@@ -0,0 +1,27 @@
+from typing import List, Optional, Dict, Any
+from pydantic import BaseModel, Field
+
+
+class PluginCreate(BaseModel):
+    url: str = Field(min_length=1)
+    enabled: bool = True
+
+
+class PluginOut(BaseModel):
+    id: int
+    url: str
+    enabled: bool
+    key: Optional[str]
+    name: Optional[str]
+    version: Optional[str]
+    supported_exts: Optional[List[str]]
+    default_bounds: Optional[Dict[str, Any]]
+    default_maximized: Optional[bool]
+    icon: Optional[str]
+    description: Optional[str]
+    author: Optional[str]
+    website: Optional[str]
+    github: Optional[str]
+
+    class Config:
+        from_attributes = True