chore: rename app from Solitaire Quest to Ferrous Solitaire

Updates all in-tree references:
- Android package: com.solitairequest.app → com.ferrousapp.solitaire
- APK name: solitaire-quest → ferrous-solitaire
- Data dir: solitaire_quest → ferrous_solitaire (across all 6 data modules + engine)
- Keyring service: solitaire_quest_server → ferrous_solitaire_server
- Android Keystore key: solitaire_quest_token_key → ferrous_solitaire_token_key
- Gitea repo: Rusty_Solitare → Ferrous-Solitaire (also fixes "Solitare" typo)
- Renamed pkg/solitaire-quest* → pkg/ferrous-solitaire*
- Updated ArgoCD, docker-compose, CI workflow, build script, all docs

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

solitaire_app/src/lib.rs

@@ -109,7 +109,7 @@ pub fn run() {
                         title: "Ferrous Solitaire".into(),
                         // X11/Wayland WM_CLASS so taskbar managers group
                         // multiple windows of this app correctly.
-                        name: Some("solitaire-quest".into()),
+                        name: Some("ferrous-solitaire".into()),
                         resolution: window_resolution,
                         position: window_position,
                         // AutoNoVsync prefers Mailbox (triple-buffered) and