[bug]: Duplicate Endpoint Mapping

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### Bug Description:
- **Detailed Description:**
Both `OperationController` and `StockController` use the base mapping `/api/stocks`, which can lead to conflicts or unexpected behavior in routing. This ambiguity might result in some endpoints not being reached as intended.
- **How to Solve:**
1. **Decide on Clear Responsibilities:**
Review the endpoints provided by each controller. If they serve different purposes (e.g., one for CRUD operations and another for external API calls), consider separating their base paths.
2. **Update Mappings:**
For example, you could change `StockController` to use `/api/stock-details` or `/api/stocks/info`:
```java
@RestController
@RequestMapping("/api/stocks/info")
public class StockController { ... }
```
3. **Test Endpoints:**
Verify that all endpoints are accessible and return the expected responses after the change.

Start by locating OperationController and StockController and reviewing every endpoint under their current /api/stocks mappings. Determine their distinct responsibilities, choose non-conflicting base paths, and exercise all affected endpoints to confirm they remain reachable and return the expected responses.

Written by the indexing model from the issue text.