feat: Implement pagination for companies, investors, and projects endpoints

app/schemas/router_schemas.py

@@ -1,9 +1,12 @@
 from datetime import datetime
 from enum import Enum
-from typing import Any, List, Optional
+from typing import Any, Generic, List, Optional, TypeVar
 
 from pydantic import BaseModel
 
+# Generic type for pagination
+T = TypeVar("T")
+
 
 class InvestmentStage(str, Enum):
     SEED = "SEED"
@@ -184,3 +187,16 @@ class InvestorFundList(BaseModel):
     """List of investor-fund combinations"""
 
     investor_funds: List[InvestorFundData]
+
+
+class PaginatedResponse(BaseModel, Generic[T]):
+    """Generic paginated response schema"""
+
+    items: List[T]
+    total: int
+    page: int
+    page_size: int
+    total_pages: int
+
+    class Config:
+        from_attributes = True