Add launcher preferences and modular landing studio [skip ci]

panel/server/src/routes/landing.rs

@@ -66,6 +66,30 @@ pub struct LandingBlock {
     pub options: serde_json::Value,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(default)]
+pub struct LandingTheme {
+    pub background: String,
+    pub surface: String,
+    pub accent: String,
+    pub text: String,
+    pub muted: String,
+    pub max_width: u16,
+    pub radius: u8,
+    pub font: String,
+    pub footer_text: String,
+}
+
+impl Default for LandingTheme {
+    fn default() -> Self {
+        Self {
+            background: "#090a0f".into(), surface: "#151620".into(), accent: "#6d6af5".into(),
+            text: "#f1f2f6".into(), muted: "#8b8f9a".into(), max_width: 1140, radius: 14,
+            font: "Inter".into(), footer_text: "Your worlds, one click away.".into(),
+        }
+    }
+}
+
 impl Default for LandingBlock {
     fn default() -> Self {
         Self {
@@ -98,6 +122,7 @@ pub struct LandingConfig {
     pub blocks: Vec<LandingBlock>,
     pub faqs: Vec<FaqItem>,
     pub custom_css: String,
+    pub theme: LandingTheme,
 }
 
 impl Default for LandingConfig {
@@ -145,6 +170,7 @@ impl Default for LandingConfig {
                 },
             ],
             custom_css: "".into(),
+            theme: LandingTheme::default(),
         }
     }
 }
@@ -178,6 +204,15 @@ pub async fn admin_get_landing(_: AdminUser, State(state): State<AppState>) -> A
 }
 
 pub async fn admin_put_landing(_: AdminUser, State(state): State<AppState>, Json(cfg): Json<LandingConfig>) -> AppResult<Json<LandingConfig>> {
+    if cfg.blocks.len() > 100 || cfg.custom_css.len() > 100_000 {
+        return Err(AppError::bad_request("landing page exceeds the editor limits"));
+    }
+    let mut ids = std::collections::HashSet::new();
+    for block in &cfg.blocks {
+        if block.id.is_empty() || !ids.insert(&block.id) {
+            return Err(AppError::bad_request("landing section IDs must be unique"));
+        }
+    }
     store::kv_set(&state, "landing_page", &cfg).await?;
     Ok(Json(cfg))
 }