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-entities/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2024"
 [dependencies]
 axum.workspace = true
 serde.workspace = true
+serde_json.workspace = true
 utoipa.workspace = true
 surrealdb.workspace = true
 anyhow.workspace = true
@@ -13,3 +14,4 @@ thiserror.workspace = true
 uuid.workspace = true
 strum.workspace = true
 strum_macros.workspace = true
+chrono.workspace = true