Fix Pydantic V2 and FastAPI deprecation warnings

- Replace orm_mode with from_attributes in Pydantic Config classes (federated_learning.py, wallet.py, decentralized_memory.py, atomic_swap.py)
- Replace regex with pattern in FastAPI Query parameters (staking.py)

apps/coordinator-api/src/app/contexts/staking/routers/staking.py

@@ -604,7 +604,7 @@ async def get_supported_agents(
 @rate_limit(rate=200, per=60)
 async def get_staking_stats(
     request: Request,
-    period: str = Query(default="daily", regex="^(hourly|daily|weekly|monthly)$"),
+    period: str = Query(default="daily", pattern="^(hourly|daily|weekly|monthly)$"),
     session: Session = Depends(get_session),
     staking_service: StakingService = Depends(get_staking_service)
 ) -> StakingStatsResponse:
@@ -622,8 +622,8 @@ async def get_staking_stats(
 @rate_limit(rate=200, per=60)
 async def get_staking_leaderboard(
     request: Request,
-    period: str = Query(default="weekly", regex="^(daily|weekly|monthly)$"),
-    metric: str = Query(default="total_staked", regex="^(total_staked|total_rewards|apy)$"),
+    period: str = Query(default="weekly", pattern="^(daily|weekly|monthly)$"),
+    metric: str = Query(default="total_staked", pattern="^(total_staked|total_rewards|apy)$"),
     limit: int = Query(default=50, ge=1, le=100),
     session: Session = Depends(get_session),
     staking_service: StakingService = Depends(get_staking_service)
@@ -674,7 +674,7 @@ async def get_my_staking_positions(
 @rate_limit(rate=200, per=60)
 async def get_my_staking_rewards(
     request: Request,
-    period: str = Query(default="monthly", regex="^(daily|weekly|monthly)$"),
+    period: str = Query(default="monthly", pattern="^(daily|weekly|monthly)$"),
     session: Session = Depends(get_session),
     staking_service: StakingService = Depends(get_staking_service),
     current_user: dict = Depends(get_current_user)

apps/coordinator-api/src/app/schemas/atomic_swap.py

@@ -37,7 +37,7 @@ class SwapResponse(BaseModel):
     target_timelock: int
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 class SwapActionRequest(BaseModel):

apps/coordinator-api/src/app/schemas/decentralized_memory.py

@@ -24,7 +24,7 @@ class MemoryNodeResponse(BaseModel):
     tags: list[str]
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 class MemoryQueryRequest(BaseModel):

apps/coordinator-api/src/app/schemas/federated_learning.py

@@ -27,7 +27,7 @@ class FederatedSessionResponse(BaseModel):
     global_model_cid: str | None
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 class JoinSessionRequest(BaseModel):

apps/coordinator-api/src/app/schemas/wallet.py

@@ -19,7 +19,7 @@ class WalletResponse(BaseModel):
     is_active: bool
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 class TransactionRequest(BaseModel):
@@ -38,4 +38,4 @@ class TransactionResponse(BaseModel):
     status: TransactionStatus
 
     class Config:
-        orm_mode = True
+        from_attributes = True