feat: add panic tracking and logging with PanicTracker

- Implemented PanicTracker to log panics using tracing within a dedicated span.
- Introduced PanicInfo struct to capture panic details.
- Added tests for panic catching and hook restoration.

feat: implement token-bucket rate limiter

- Created RateLimiter to manage token consumption with configurable rates and burst capacity.
- Added methods for acquiring tokens and checking available tokens.
- Included tests for rate limiting behavior and token availability.

feat: add automatic retry with exponential backoff

- Developed retry function to handle transient errors with configurable retry strategies.
- Introduced RetryConfig for customizing retry behavior and jitter.
- Added tests for various retry scenarios and error handling.

feat: implement graceful shutdown coordination

- Created ShutdownManager to manage shutdown signals and task completion.
- Introduced ShutdownSignal for tasks to observe shutdown requests.
- Added tests for shutdown request handling and task draining.

feat: add timeout functionality for async operations

- Implemented with_timeout function to enforce execution time limits on futures.
- Created Timeout struct for wrapping futures with a deadline.
- Added tests for timeout behavior and error mapping.

crates/corex-crypto/Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "corex-crypto"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.75"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/asepharyana/mytheclipse"
+homepage = "https://github.com/asepharyana/mytheclipse"
+documentation = "https://docs.rs/corex-crypto"
+authors = ["asepharyana <superaseph@gmail.com>"]
+description = "Safe hashing, encryption, and token helpers (Argon2id, AES-256-GCM, JWT/Paseto) with key rotation support."
+readme = "README.md"
+keywords = ["crypto", "argon2", "aes-gcm", "jwt", "security"]
+categories = ["cryptography", "authentication"]
+
+[features]
+default = ["password", "encryption", "tokens"]
+# Low-level primitives are always available (zero-cost). The feature flags
+# pull in the backing SDK crates.
+password = ["dep:password-hash", "dep:argon2"]
+encryption = ["dep:aead", "dep:aes-gcm", "dep:rand_core", "dep:rand"]
+tokens = ["encryption", "dep:serde", "dep:serde_json", "dep:base64", "dep:jsonwebtoken"]
+
+[dependencies]
+tracing = "0.1"
+
+# Optional backends
+argon2 = { version = "0.5", default-features = false, features = ["std"], optional = true }
+password-hash = { version = "0.5", default-features = false, features = ["std"], optional = true }
+aes-gcm = { version = "0.10", default-features = false, features = ["aes", "alloc"], optional = true }
+aead = { version = "0.5", default-features = false, features = ["alloc"], optional = true }
+jsonwebtoken = { version = "9", default-features = false, optional = true }
+base64 = { version = "0.22", default-features = false, optional = true }
+serde = { version = "1", optional = true, features = ["derive"] }
+serde_json = { version = "1", optional = true }
+rand = { version = "0.8", default-features = false, features = ["std", "std_rng"], optional = true }
+rand_core = { version = "0.6", optional = true }