feat(scripting): connect give_item to wallet rewards, add [E] Interact prompt and toast feedback

backend/app/routers/wallet.py

@@ -76,3 +76,38 @@ async def get_wallet_transactions(
         limit=limit,
         offset=offset,
     )
+
+
+class RewardRequest(BaseModel):
+    amount: int = Field(..., gt=0, le=10000, description="Amount of Buffalo Chips to reward")
+    reason: str | None = Field(default="in_game_reward", description="Reward source or reason")
+
+
+class RewardResponse(BaseModel):
+    success: bool
+    amount: int
+    new_balance: int
+
+
+@router.post("/reward", response_model=RewardResponse)
+async def reward_chips(
+    payload: RewardRequest,
+    current_user: CurrentUser,
+    db: DbDep,
+):
+    """Credit in-game Buffalo Chips reward directly to the player's wallet."""
+    wallet, tx = await wallet_service.credit(
+        db,
+        user_id=current_user.id,
+        amount=payload.amount,
+        tx_type=TransactionType.admin_adjustment,
+        reference_type="gameplay_reward",
+        reference_id=payload.reason or "in_game_reward",
+        metadata={"reason": payload.reason or "in_game_reward"},
+    )
+    return RewardResponse(
+        success=True,
+        amount=payload.amount,
+        new_balance=wallet.balance,
+    )
+