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.

Cargo.lock

@@ -2123,7 +2123,9 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "axum",
+ "chrono",
  "serde",
+ "serde_json",
  "strum 0.27.2",
  "strum_macros 0.27.2",
  "surrealdb",
@@ -2302,12 +2304,14 @@ dependencies = [
  "axum",
  "axum-extra",
  "axum-test",
+ "base64 0.22.1",
  "chrono",
  "futures",
  "imphnen-entities",
  "imphnen-libs",
  "imphnen-utils",
  "lazy_static",
+ "log",
  "rand 0.9.2",
  "regex",
  "serde",