Port relay service from Python to Rust + Rouille

- PostgreSQL with chrono datetime support
- JWT authentication (jsonwebtoken crate)
- bcrypt API key hashing
- In-memory rate limiter (10 req/min for chat)
- HTTP proxy to reason/recall services
- ~3.8MB binary vs ~50MB Python

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "relay"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rouille = "3.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+chrono = { version = "0.4", features = ["serde"] }
+postgres = { version = "0.19", features = ["with-chrono-0_4"] }
+jsonwebtoken = "9.2"
+bcrypt = "0.15"
+ureq = { version = "2.9", features = ["json"] }
+uuid = { version = "1.0", features = ["v4"] }
+rand = "0.8"
+hex = "0.4"
+
+[profile.release]
+strip = true
+lto = true