Feat: Add Sentry monitoring for runtime exception capture (#823)

[Delightech28]

Description

This PR integrates Sentry monitoring for runtime exception capture into the backend, addressing #823.

Changes Made

• Dependencies: Added sentry, sentry-tracing, and sentry-tower crates.
• Configuration: Added support for loading the SENTRY_DSN from environment variables.
• Initialization: Initialized the Sentry client in main.rs before initializing telemetry to capture all early errors. The Sentry guard is maintained for the application's lifecycle to ensure asynchronous error reporting.
• Tracing Integration: Added sentry_tracing::layer() to the tracing subscriber in telemetry.rs to automatically capture error! level events.
• Middleware:
  • Attached sentry_tower::NewSentryLayer and sentry_tower::SentryHttpLayer to the Axum Router to automatically extract request contexts (client IP, HTTP headers, etc.).
  • Updated jwt_auth_middleware and signature_auth_middleware in auth.rs to utilize sentry::configure_scope() for injecting the active user_id context.

Acceptance Criteria Met

• Exceptions are caught and reported to Sentry dashboard automatically via tracing integration.
• Includes context such as client IP, user ID, and stack traces.
• No performance penalty or main-thread block on report delivery (Sentry operates in a background thread).

How to Test

1. Set the SENTRY_DSN environment variable in your .env file.
2. Trigger an unhandled error or a tracing::error! log.
3. Verify that the event successfully appears in your Sentry dashboard alongside the user ID, request data, and client IP.

closes #823

[ONEONUORA]

@Delightech28
Run cargo fmt --all -- --check
and clippy

[ONEONUORA]

@Delightech28
Update on this Pr
you will be unassign in 6hrs

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[ONEONUORA]

@Delightech28

Run cargo clippy --all-targets --all-features -- -D warnings