Initial commit: web-app boilerplate with auth, OIDC/SSO, admin panel, i18n

Rust (cot framework) + PostgreSQL boilerplate providing:

- Session-based auth with Admin/User roles
- OIDC/SSO login with PKCE, group-to-role mapping, auto-provisioning
- Admin panel: user management, settings, debug/config inspector
- 3-tier config system (compiled default → DB → FURU_* env vars)
- i18n (English + Russian) with compile-time translations macro
- JSON API skeleton (GET /api/me)
- DB-backed sessions (survive server restarts)

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

Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "furumusic"
+version = "0.1.0"
+edition = "2024"
+description = "Reusable web-app boilerplate: auth, OIDC/SSO, admin panel, user management, i18n, PostgreSQL"
+
+[dependencies]
+cot = { path = "../cot/cot", features = ["postgres", "json"] }
+serde = { version = "1", features = ["derive"] }
+openidconnect = "4.0"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls"] }
+tokio = { version = "1", features = ["sync"] }
+base64 = "0.22"
+serde_json = "1"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }