feat: add reset() method to clear rate limit state for a given IP [ GSSOC '26 ] (JhaSourav07#1168)

## Description
Fixes JhaSourav07#1165 

Adds a `reset(ip)` method to `RateLimiter` that clears the request
count for a given IP by calling `cache.delete(ip)`. This allows
rate limit state to be cleared immediately after a successful
authentication or admin action, without waiting for TTL expiry.

Depends on the `delete()` method added to `TTLCache` in the previous
contribution.

## Pillar
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Visual Preview
N/A — internal rate limiting logic, no visual output.

## Checklist before requesting a review:
- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
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resolved all errors.
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parameter.
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Author: JhaSourav07

lib/rate-limit.ts

@@ -46,6 +46,20 @@ export class RateLimiter {
     this.cache.set(ip, current + 1, this.windowMs);
     return true;
   }
+  /**
+   * Resets the request count for a given IP address.
+   *
+   * Useful for clearing rate limit state after a successful
+   * authentication or admin action.
+   *
+   * @param ip - The IP address to reset.
+   *
+   * @example
+   * rateLimiter.reset("192.168.1.1");
+   */
+  reset(ip: string): void {
+    this.cache.delete(ip);
+  }
 }
 
 // Global instance for track-user endpoint (5 requests per IP per minute)