Add launcher engine (scopenet-core) and admin panel server

- scopenet-shared: wire types for branding, auth, instances, manifests
- scopenet-core: Mojang versions/libraries/assets, automatic Java runtimes,
  Fabric/Quilt/Forge/NeoForge installation, file sync, launch command
  builder, Microsoft auth, servers.dat injection, server list ping
- scopenet-panel: Axum + SQLite admin API with JWT auth, users/groups,
  branding, settings, instances, Modrinth/CurseForge/zip import, file
  hosting and launch stats

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011ARcGWxLx21FwXJ3yfGriS

panel/server/src/routes/mod.rs

@@ -0,0 +1,46 @@
+pub mod admin;
+pub mod meta;
+pub mod public;
+
+use crate::state::AppState;
+use axum::extract::DefaultBodyLimit;
+use axum::routing::{delete, get, post};
+use axum::Router;
+
+pub fn api(state: &AppState) -> Router<AppState> {
+    let upload_limit = state.cfg.max_upload_mb * 1024 * 1024;
+
+    let launcher = Router::new()
+        .route("/launcher/manifest", get(public::manifest))
+        .route("/launcher/instances/{id}", get(public::instance_manifest))
+        .route("/launcher/events", post(public::event))
+        .route("/auth/login", post(public::login))
+        .route("/auth/register", post(public::register))
+        .route("/auth/me", get(public::me));
+
+    let admin = Router::new()
+        .route("/stats", get(admin::stats))
+        .route("/users", get(admin::list_users).post(admin::create_user))
+        .route("/users/{id}", axum::routing::patch(admin::update_user).delete(admin::delete_user))
+        .route("/groups", get(admin::list_groups).post(admin::create_group))
+        .route("/groups/{id}", delete(admin::delete_group))
+        .route("/branding", get(admin::get_branding).put(admin::put_branding))
+        .route("/settings", get(admin::get_settings).put(admin::put_settings))
+        .route("/instances", get(admin::list_instances).post(admin::create_instance))
+        .route("/instances/{id}", get(admin::get_instance).put(admin::update_instance).delete(admin::delete_instance))
+        .route("/instances/{id}/reset", post(admin::reset_source))
+        .route("/instances/{id}/import/modrinth", post(admin::import_modrinth))
+        .route("/instances/{id}/import/curseforge", post(admin::import_curseforge))
+        .route("/instances/{id}/import/upload", post(admin::import_upload))
+        .route("/instances/{id}/files", post(admin::upload_files).delete(admin::delete_file))
+        .route("/uploads", post(admin::upload_media))
+        .route("/meta/minecraft", get(meta::minecraft))
+        .route("/meta/loaders/{loader}", get(meta::loaders))
+        .route("/modrinth/search", get(meta::modrinth_search))
+        .route("/modrinth/project/{id}/versions", get(meta::modrinth_versions))
+        .route("/curseforge/search", get(meta::curseforge_search))
+        .route("/curseforge/mod/{id}/files", get(meta::curseforge_files))
+        .layer(DefaultBodyLimit::max(upload_limit));
+
+    Router::new().nest("/api/v1", launcher).nest("/api/admin", admin)
+}