ODIAN Launcher: hub, installer, local stack and remembered sign-in (M2)

- Tauri 2 + Svelte 5 hub in ODIAN dark: patch notes and roadmap, install and
  update progress, local stack status, settings with DHP and MCP addresses.
- crates/odian-packs: Rust installer for pack format v1 (signed manifests,
  resumable verified downloads from a DHP or an ODIAN drive), byte-compatible
  with ODIAN_MCP_Server's Python odian_packs.
- Local stack on 127.0.0.1: Postgres -> Engine API -> tile server -> Odian.exe,
  one Job Object, clean shutdown; database snapshot restore on a fresh PC only.
- Keycloak sign-in through the DHP's MCP, remembered until Sign out with a
  launcher session that renews the Engine token silently.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

crates/odian-packs/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "odian-packs"
+version = "0.1.0"
+description = "ODIAN pack format v1: verify signed manifests and install a version from a site or an ODIAN drive"
+edition = "2021"
+rust-version = "1.81"
+publish = false
+
+[lib]
+name = "odian_packs"
+
+[dependencies]
+# Same HTTP/TLS stack as src-tauri: reqwest 0.12, rustls (ring), no OpenSSL.
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "stream"] }
+tokio = { version = "1", features = ["rt", "fs", "sync", "time", "macros"] }
+tokio-util = "0.7"
+futures-util = "0.3"
+bytes = "1"
+sha2 = "0.10"
+ed25519-dalek = "2.2"
+base64 = "0.22"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tar = { version = "0.4", default-features = false }
+rusqlite = { version = "0.40", features = ["bundled"] }
+thiserror = "2"
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
+tempfile = "3"