feat: 添加站点设置中的 favicon URL 支持，更新相关接口和页面

backend/src/app.rs

@@ -397,6 +397,14 @@ impl Hooks for App {
                                 Some(trimmed.to_string())
                             }
                         });
+                    let seo_favicon_url = settings["seo_favicon_url"].as_str().and_then(|value| {
+                        let trimmed = value.trim();
+                        if trimmed.is_empty() {
+                            None
+                        } else {
+                            Some(trimmed.to_string())
+                        }
+                    });
 
                     let item = site_settings::ActiveModel {
                         id: Set(settings["id"].as_i64().unwrap_or(1) as i32),
@@ -441,6 +449,7 @@ impl Hooks for App {
                         music_enabled: Set(music_enabled),
                         maintenance_mode_enabled: Set(maintenance_mode_enabled),
                         maintenance_access_code: Set(maintenance_access_code),
+                        seo_favicon_url: Set(seo_favicon_url),
                         ai_enabled: Set(settings["ai_enabled"].as_bool()),
                         paragraph_comments_enabled: Set(settings["paragraph_comments_enabled"]
                             .as_bool()

backend/src/controllers/admin_api.rs

@@ -213,6 +213,7 @@ pub struct AdminSiteSettingsResponse {
     pub media_r2_public_base_url: Option<String>,
     pub media_r2_access_key_id: Option<String>,
     pub media_r2_secret_access_key: Option<String>,
+    pub seo_favicon_url: Option<String>,
     pub seo_default_og_image: Option<String>,
     pub seo_default_twitter_handle: Option<String>,
     pub seo_wechat_share_qr_enabled: bool,
@@ -1068,6 +1069,7 @@ fn build_settings_response(
         media_r2_public_base_url: item.media_r2_public_base_url,
         media_r2_access_key_id: item.media_r2_access_key_id,
         media_r2_secret_access_key: item.media_r2_secret_access_key,
+        seo_favicon_url: item.seo_favicon_url,
         seo_default_og_image: item.seo_default_og_image,
         seo_default_twitter_handle: item.seo_default_twitter_handle,
         seo_wechat_share_qr_enabled: item.seo_wechat_share_qr_enabled.unwrap_or(false),

backend/src/controllers/site_settings.rs

@@ -160,6 +160,8 @@ pub struct SiteSettingsPayload {
     pub media_r2_access_key_id: Option<String>,
     #[serde(default, alias = "mediaR2SecretAccessKey")]
     pub media_r2_secret_access_key: Option<String>,
+    #[serde(default, alias = "seoFaviconUrl")]
+    pub seo_favicon_url: Option<String>,
     #[serde(default, alias = "seoDefaultOgImage")]
     pub seo_default_og_image: Option<String>,
     #[serde(default, alias = "seoDefaultTwitterHandle")]
@@ -220,6 +222,7 @@ pub struct PublicSiteSettingsResponse {
     pub subscription_popup_title: String,
     pub subscription_popup_description: String,
     pub subscription_popup_delay_seconds: i32,
+    pub seo_favicon_url: Option<String>,
     pub seo_default_og_image: Option<String>,
     pub seo_default_twitter_handle: Option<String>,
     pub seo_wechat_share_qr_enabled: bool,
@@ -776,6 +779,9 @@ impl SiteSettingsPayload {
             item.media_r2_secret_access_key =
                 normalize_optional_string(Some(media_r2_secret_access_key));
         }
+        if let Some(seo_favicon_url) = self.seo_favicon_url {
+            item.seo_favicon_url = normalize_optional_string(Some(seo_favicon_url));
+        }
         if let Some(seo_default_og_image) = self.seo_default_og_image {
             item.seo_default_og_image = normalize_optional_string(Some(seo_default_og_image));
         }
@@ -942,6 +948,7 @@ fn default_payload() -> SiteSettingsPayload {
         media_r2_public_base_url: None,
         media_r2_access_key_id: None,
         media_r2_secret_access_key: None,
+        seo_favicon_url: None,
         seo_default_og_image: None,
         seo_default_twitter_handle: None,
         seo_wechat_share_qr_enabled: Some(false),
@@ -1041,6 +1048,7 @@ fn public_response(model: Model) -> PublicSiteSettingsResponse {
         subscription_popup_delay_seconds: model
             .subscription_popup_delay_seconds
             .unwrap_or_else(default_subscription_popup_delay_seconds),
+        seo_favicon_url: model.seo_favicon_url,
         seo_default_og_image: model.seo_default_og_image,
         seo_default_twitter_handle: model.seo_default_twitter_handle,
         seo_wechat_share_qr_enabled: model.seo_wechat_share_qr_enabled.unwrap_or(false),

backend/src/fixtures/site_settings.yaml

@@ -60,3 +60,4 @@
   ai_system_prompt: "你是这个博客的站内 AI 助手。请优先依据检索到的站内内容回答问题，回答保持准确、简洁、清晰；如果上下文不足，请明确说明，不要编造。"
   ai_top_k: 4
   ai_chunk_size: 1200
+  seo_favicon_url: null

backend/src/initializers/content_sync.rs

@@ -111,6 +111,7 @@ async fn sync_site_settings(ctx: &AppContext, base: &Path) -> Result<()> {
     let music_enabled = seed["music_enabled"].as_bool().or(Some(true));
     let maintenance_mode_enabled = seed["maintenance_mode_enabled"].as_bool().or(Some(false));
     let maintenance_access_code = as_optional_string(&seed["maintenance_access_code"]);
+    let seo_favicon_url = as_optional_string(&seed["seo_favicon_url"]);
     let comment_verification_mode = as_optional_string(&seed["comment_verification_mode"]);
     let subscription_verification_mode =
         as_optional_string(&seed["subscription_verification_mode"]);
@@ -196,6 +197,9 @@ async fn sync_site_settings(ctx: &AppContext, base: &Path) -> Result<()> {
         if is_blank(&existing.maintenance_access_code) {
             model.maintenance_access_code = Set(maintenance_access_code.clone());
         }
+        if is_blank(&existing.seo_favicon_url) {
+            model.seo_favicon_url = Set(seo_favicon_url.clone());
+        }
         if existing.ai_enabled.is_none() {
             model.ai_enabled = Set(seed["ai_enabled"].as_bool());
         }
@@ -278,6 +282,7 @@ async fn sync_site_settings(ctx: &AppContext, base: &Path) -> Result<()> {
         music_enabled: Set(music_enabled),
         maintenance_mode_enabled: Set(maintenance_mode_enabled),
         maintenance_access_code: Set(maintenance_access_code),
+        seo_favicon_url: Set(seo_favicon_url),
         ai_enabled: Set(seed["ai_enabled"].as_bool()),
         paragraph_comments_enabled: Set(seed["paragraph_comments_enabled"]
             .as_bool()

backend/src/models/_entities/site_settings.rs

@@ -78,6 +78,8 @@ pub struct Model {
     #[sea_orm(column_type = "Text", nullable)]
     pub media_r2_secret_access_key: Option<String>,
     #[sea_orm(column_type = "Text", nullable)]
+    pub seo_favicon_url: Option<String>,
+    #[sea_orm(column_type = "Text", nullable)]
     pub seo_default_og_image: Option<String>,
     pub seo_default_twitter_handle: Option<String>,
     pub seo_wechat_share_qr_enabled: Option<bool>,