scaffold: Backend core — Cargo.toml, main.rs, config, models, panel adapter

Axum server entry point, AppConfig, AppState, ApiError, all model
structs (auth, license, server, wipe), and the PanelAdapter trait
that abstracts AMP/Pterodactyl/companion connections.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/Cargo.toml

@@ -0,0 +1,68 @@
+[package]
+name = "corrosion-api"
+version = "0.1.0"
+edition = "2021"
+description = "Corrosion — Rust Server Management Platform API"
+license = "Proprietary"
+
+[dependencies]
+# Web framework
+axum = { version = "0.8", features = ["macros", "multipart"] }
+axum-extra = { version = "0.10", features = ["typed-header"] }
+tower = "0.5"
+tower-http = { version = "0.6", features = ["cors", "trace", "limit", "fs"] }
+hyper = { version = "1", features = ["full"] }
+
+# Async runtime
+tokio = { version = "1", features = ["full"] }
+
+# Database
+sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "postgres", "uuid", "chrono", "json", "migrate"] }
+
+# Messaging
+async-nats = "0.38"
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# Auth
+jsonwebtoken = "9"
+argon2 = "0.5"
+totp-rs = { version = "5", features = ["qr", "gen_secret"] }
+
+# Encryption
+aes-gcm = "0.10"
+hmac = "0.12"
+sha2 = "0.10"
+base64 = "0.22"
+rand = "0.8"
+
+# HTTP client (panel APIs, Cloudflare, Steam, PayPal)
+reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }
+
+# Email
+lettre = { version = "0.11", features = ["tokio1-rustls-tls"] }
+
+# Scheduling
+tokio-cron-scheduler = "0.13"
+
+# Logging
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+
+# UUID
+uuid = { version = "1", features = ["v4", "serde"] }
+
+# Date/time
+chrono = { version = "0.4", features = ["serde"] }
+
+# Config
+dotenvy = "0.15"
+
+# Error handling
+thiserror = "2"
+anyhow = "1"
+
+# Async trait support
+async-trait = "0.1"