fix(deps): unify workspace dependency versions and clean up CI

- Upgrade dashmap 6.0→6.1, tokio-tungstenite 0.21→0.24 in workspace
- Upgrade rust-version 1.75→1.85 (CI uses Rust 1.89)
- Remove unused arrayfire from ml crate
- Unify member crates to use workspace = true (nalgebra, dashmap, tokio-tungstenite)
- Fix data crate WebSocket connect calls for tungstenite 0.24 API (Url→str)
- Remove redundant KUBERNETES_RUNTIME_CLASS_NAME from training templates
  (runner rev 34 sets nvidia runtime globally)

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

crates/ml/Cargo.toml

@@ -99,7 +99,6 @@ candle-optimisers = { git = "https://github.com/KGrewal1/optimisers" }  # Base w
 # TODO: Re-enable after running: sudo apt-get install -y libopenblas-dev
 ndarray = { workspace = true, features = ["rayon"] }
 nalgebra = { version = "0.33", features = ["serde-serialize"] }
-arrayfire = { version = "3.8", optional = true }
 
 # MINIMAL statistics only - ALL HEAVY ML ALGORITHMS REMOVED
 # linfa ecosystem (linfa, linfa-clustering, linfa-linear, linfa-reduction) - REMOVED (200+ deps)
@@ -140,7 +139,7 @@ databento = "0.34"  # Databento API client for downloading data (includes async
 mimalloc = { version = "0.1", optional = true }  # Fast memory allocator
 dotenv = "0.15"  # Load .env files for API keys
 parking_lot = { version = "0.12", features = ["hardware-lock-elision"] }
-dashmap = { version = "6.1", features = ["serde"] }
+dashmap = { workspace = true }
 once_cell = "1.19"
 lazy_static.workspace = true
 flate2 = "1.0"