feat: Add public status page with 10-second polling

Implement status.corrosionmgmt.com public status page showcasing all
Corrosion servers that opt-in. Drives platform visibility and attracts
new customers.

Backend:
- Migration 007: status_page_description TEXT column
- models/public.rs: PublicServerStatus, PlatformHealth, StatusPageResponse
- db/public.rs: get_public_servers() with uptime calculations (24h/7d/30d)
- api/public.rs: GET /api/public/status (no auth)
- api/settings.rs: public site config endpoints (auth required)

Frontend:
- StatusPageView.vue: Server grid with live stats, uptime badges, wipe schedules
- Platform health header: total servers, online count, total players
- Auto-refresh every 10 seconds via polling
- Mobile-responsive design
- SettingsView.vue: Public Status tab with opt-in toggle

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/src/api/settings.rs

@@ -0,0 +1,85 @@
+use std::sync::Arc;
+
+use axum::{
+    extract::State,
+    routing::{get, put},
+    Json, Router,
+};
+
+use crate::db;
+use crate::middleware::auth::AuthUser;
+use crate::models::error::{ApiError, ApiResult};
+use crate::models::public::{PublicSiteConfig, UpdatePublicSiteRequest};
+use crate::AppState;
+
+pub fn router() -> Router<Arc<AppState>> {
+    Router::new()
+        .route("/public-site", get(get_public_site_settings))
+        .route("/public-site", put(update_public_site_settings))
+}
+
+/// GET /api/settings/public-site — Get public site configuration
+async fn get_public_site_settings(
+    auth: AuthUser,
+    State(state): State<Arc<AppState>>,
+) -> ApiResult<Json<PublicSiteConfig>> {
+    let license_id = auth.license_id.ok_or(ApiError::LicenseInvalid)?;
+
+    let config = db::public::get_public_site_config(&state.db, license_id)
+        .await
+        .map_err(|e| ApiError::Internal(format!("Failed to fetch config: {}", e)))?;
+
+    match config {
+        Some(cfg) => Ok(Json(cfg)),
+        None => {
+            // Create default config if none exists
+            let config_id = db::public::create_public_site_config(&state.db, license_id)
+                .await
+                .map_err(|e| ApiError::Internal(format!("Failed to create config: {}", e)))?;
+
+            // Fetch the newly created config
+            let new_config = db::public::get_public_site_config(&state.db, license_id)
+                .await
+                .map_err(|e| ApiError::Internal(format!("Failed to fetch new config: {}", e)))?
+                .ok_or_else(|| ApiError::Internal("Config creation failed".to_string()))?;
+
+            Ok(Json(new_config))
+        }
+    }
+}
+
+/// PUT /api/settings/public-site — Update public site configuration
+async fn update_public_site_settings(
+    auth: AuthUser,
+    State(state): State<Arc<AppState>>,
+    Json(req): Json<UpdatePublicSiteRequest>,
+) -> ApiResult<Json<serde_json::Value>> {
+    let license_id = auth.license_id.ok_or(ApiError::LicenseInvalid)?;
+
+    // Ensure config exists
+    let config_exists = db::public::get_public_site_config(&state.db, license_id)
+        .await
+        .map_err(|e| ApiError::Internal(format!("Failed to check config: {}", e)))?;
+
+    if config_exists.is_none() {
+        db::public::create_public_site_config(&state.db, license_id)
+            .await
+            .map_err(|e| ApiError::Internal(format!("Failed to create config: {}", e)))?;
+    }
+
+    // Update fields
+    db::public::update_public_site_config(
+        &state.db,
+        license_id,
+        req.show_on_status_page,
+        req.status_page_description,
+        req.site_enabled,
+    )
+    .await
+    .map_err(|e| ApiError::Internal(format!("Failed to update config: {}", e)))?;
+
+    Ok(Json(serde_json::json!({
+        "success": true,
+        "message": "Public site settings updated"
+    })))
+}