feat(friendships): create module structure and schemas

backend/src/v1/friendships/dependencies.py

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+from __future__ import annotations

backend/src/v1/friendships/repository.py

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+from __future__ import annotations

backend/src/v1/friendships/router.py

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+from __future__ import annotations

backend/src/v1/friendships/schemas.py

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+from __future__ import annotations
+from datetime import datetime
+from typing import Optional
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+
+class UserBasicInfo(BaseModel):
+    id: str
+    username: str
+    avatar_url: Optional[str] = None
+
+
+class FriendRequestCreate(BaseModel):
+    target_user_id: UUID
+    content: Optional[str] = Field(None, max_length=200)
+
+
+class FriendRequestResponse(BaseModel):
+    id: UUID
+    sender: UserBasicInfo
+    recipient: UserBasicInfo
+    content: Optional[str]
+    status: str
+    created_at: datetime
+
+
+class FriendResponse(BaseModel):
+    id: UUID
+    friend: UserBasicInfo
+    status: str
+    created_at: datetime
+    accepted_at: Optional[datetime]
+
+
+class FriendRequestAction(BaseModel):
+    pass

backend/src/v1/friendships/service.py

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+from __future__ import annotations