fix: Move imports to top-level to resolve PLC0415 linting errors

Moved inspect import and datetime imports from function scope to module level
to comply with PLC0415 rule requiring imports at top-level of files.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: codebydivine

src/thegraph_token_api/models.py

@@ -7,6 +7,7 @@
 for backward compatibility.
 """
 
+import inspect
 from dataclasses import dataclass
 
 
@@ -340,8 +341,6 @@ def convert_to_model(data: dict, model_class) -> BaseModel:
             converted_data["token1"] = SwapToken(**converted_data["token1"])
 
     # Filter only fields that exist in the dataclass
-    import inspect
-
     signature = inspect.signature(model_class)
     valid_fields = set(signature.parameters.keys())
     filtered_data = {k: v for k, v in converted_data.items() if k in valid_fields}

src/thegraph_token_api/simple.py

@@ -16,6 +16,7 @@
 """
 
 import os
+from datetime import datetime, timedelta
 
 from dotenv import load_dotenv
 
@@ -312,7 +313,7 @@ class TokenAPI:
         # SVM (Solana)
         sol_balances = await api.svm.balances(mint="So11111111111111111111111111111111111111112")
         sol_swaps = await api.svm.swaps(program_id=SwapPrograms.RAYDIUM, limit=10)
-        sol_transfers = await api.svm.transfers(mint="EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v")
+        sol_transfers = await api.svm.transfers(mint="EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v")  # pragma: allowlist secret
 
         # Utility
         health = await api.health()
@@ -497,7 +498,6 @@ async def _evm_price_history(
     ) -> list[dict]:
         """Internal EVM price history implementation."""
         net = str(network) if network else self._default_network
-        from datetime import datetime, timedelta
 
         start_time = int((datetime.now() - timedelta(days=days)).timestamp())
 
@@ -515,7 +515,6 @@ async def _evm_pool_history(
     ) -> list[dict]:
         """Internal EVM pool history implementation."""
         net = str(network) if network else self._default_network
-        from datetime import datetime, timedelta
 
         start_time = int((datetime.now() - timedelta(days=days)).timestamp())