feat:add global rate limiting with @nestjs/throttler (closes #10)

[adarshdotdev]

Description:
This PR implements global rate limiting for the backend API using @nestjs/throttler. The configuration is set to allow a maximum of 5 requests per second per IP address, helping to prevent abuse of dynamic endpoints.

Key changes:

• Installed @nestjs/throttler as a backend dependency.
• Configured ThrottlerModule in app.module.ts with limit: 5 and timeToLive: 1.
• Registered ThrottlerGuard as a global guard to enforce rate limiting on all routes.

Testing:

• Verified that after 5 rapid requests from the same IP within 1 second, subsequent requests receive a 429 Too Many Requests response.
• Confirmed that public and protected endpoints are both rate-limited as expected.

screenshort

Closes: #10

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Let me know if you want to add or change anything!

[g3Bg2]

@adarshdotdev

This PR looks good, but it adds the rate limiting globally to all the APIs internal API's as well. We need rate limiting for dynamic endpoints.

[adarshdotdev]

To clarify:

• I plan to apply rate limiting only to the dynamic endpoints handled by DynamicController (/api/* in apps/backend/src/dynamic/dynamic.controller.ts) using the @Throttle decorator.
• Other endpoints (e.g., admin, auth, etc.) will not be rate-limited.

confirm if this matches expectation before proceed.

[g3Bg2]

No, you’re applying the @Throttle decorator in dynamic.controller.ts.

Can you check again? Also, you can see that you’re applying rate limiting to other endpoints, for example, localhost:3000/hello and localhost:3000/dyan/auth/me. in your own screenshort.