feat: Implement audit logging and rate limiting middleware with SurrealDB integration

- Added audit logging middleware to track admin actions and save logs to SurrealDB.
- Introduced rate limiting middleware for public endpoints and authentication endpoints.
- Enhanced security headers middleware with nonce generation for CSP in development.
- Created utility functions for extracting real client IP addresses from headers.
- Updated Cargo.toml and Cargo.lock to include new dependencies.
- Added new schemas for audit logs and rate limiting in the entities module.
- Refactored permissions middleware to support new permission checks.

imphnen-middleware/Cargo.toml

@@ -18,8 +18,10 @@ validator.workspace = true
 axum-test.workspace = true
 surrealdb.workspace = true
 rand.workspace = true
+base64.workspace = true
 tokio.workspace = true
 chrono.workspace = true
+log.workspace = true
 anyhow.workspace = true
 tower-http.workspace = true
 futures.workspace = true