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.

Cargo.toml

@@ -0,0 +1,18 @@
+[workspace]
+resolver = "2"
+members = [
+    "server",
+]
+
+[workspace.dependencies]
+matrix-sdk = { version = "0.7", features = ["e2e-encryption", "sqlite"] }
+matrix-sdk-base = "0.7"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["full"] }
+anyhow = "1"
+thiserror = "1"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+reqwest = { version = "0.12", features = ["json", "multipart"] }
+url = "2"