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.

client/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "eifeldc-client"
+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 }
+tauri = { version = "1", features = ["shell-open", "dialog-all"] }
+tauri-plugin-oauth = "2.0"
+sled = "0.34"
+futures = "0.3"
+async-trait = "0.1"
+chrono = { version = "0.4", features = ["serde"] }
+rand = "0.8"
+base64 = "0.22"
+sha2 = "0.10"
+
+[build-dependencies]
+tauri-build = { version = "1", features = [] }