Initial commit: EifelDC - Discord-like Matrix chat platform

Includes server (Rust/Axum API proxy with voice management),
Tauri desktop client with Svelte UI, bot-sdk, Docker infra
(Synapse, PostgreSQL, Coturn, Nginx), and CI/CD pipeline.

server/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "eifeldc-server"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+matrix-sdk = { workspace = true }
+matrix-sdk-base = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+tokio = { workspace = true }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+reqwest = { workspace = true }
+url = { workspace = true }
+axum = { version = "0.7", features = ["ws"] }
+tower = "0.4"
+tower-http = { version = "0.5", features = ["cors", "fs", "trace"] }
+chrono = { version = "0.4", features = ["serde"] }
+uuid = { version = "1", features = ["v4"] }