feat: implement initial structure for activities, analytics, auth, contacts, deals, organizations, tasks, and users APIs with placeholder endpoints

app/api/v1/activities/__init__.py

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+"""Activities API package."""
+from .views import router
+
+__all__ = ["router"]

app/api/v1/activities/crud.py

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+"""CRUD helpers for activities (to be implemented)."""

app/api/v1/activities/models.py

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+"""Pydantic schemas for activity endpoints."""
+from __future__ import annotations
+
+from typing import Any, Literal
+
+from pydantic import BaseModel
+
+
+class ActivityCommentPayload(BaseModel):
+    type: Literal["comment"]
+    payload: dict[str, Any]

app/api/v1/activities/views.py

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+"""Activity timeline API stubs."""
+from __future__ import annotations
+
+from fastapi import APIRouter, status
+
+from .models import ActivityCommentPayload
+
+router = APIRouter(prefix="/deals/{deal_id}/activities", tags=["activities"])
+
+
+def _stub(endpoint: str) -> dict[str, str]:
+    return {"detail": f"{endpoint} is not implemented yet"}
+
+
+@router.get("/", status_code=status.HTTP_501_NOT_IMPLEMENTED)
+async def list_activities(deal_id: int) -> dict[str, str]:
+    """Placeholder for listing deal activities."""
+    _ = deal_id
+    return _stub("GET /deals/{deal_id}/activities")
+
+
+@router.post("/", status_code=status.HTTP_501_NOT_IMPLEMENTED)
+async def create_activity_comment(deal_id: int, payload: ActivityCommentPayload) -> dict[str, str]:
+    """Placeholder for adding a comment activity to a deal."""
+    _ = (deal_id, payload)
+    return _stub("POST /deals/{deal_id}/activities")