feat(pixelle): 加 serde_yaml + Pixelle config 路径配置项

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

src/config.rs

@@ -98,6 +98,10 @@ pub struct PixelleVideoConfig {
     pub video_fps: i64,
     pub poll_interval_secs: u64,
     pub timeout_secs: u64,
+    #[serde(default = "default_pixelle_config_path")]
+    pub config_path: String,
+    #[serde(default = "default_pixelle_compose_dir")]
+    pub compose_dir: String,
 }
 
 #[derive(Debug, Deserialize, Clone)]
@@ -165,6 +169,14 @@ fn default_pixelle_backend_provider() -> String {
     "comfy".to_string()
 }
 
+fn default_pixelle_config_path() -> String {
+    "/opt/Pixelle-Video/config.yaml".to_string()
+}
+
+fn default_pixelle_compose_dir() -> String {
+    "/opt/Pixelle-Video".to_string()
+}
+
 fn default_workflow_points_cost() -> f64 {
     10.0
 }
@@ -217,6 +229,8 @@ impl Default for PixelleVideoConfig {
             video_fps: 30,
             poll_interval_secs: 5,
             timeout_secs: 900,
+            config_path: default_pixelle_config_path(),
+            compose_dir: default_pixelle_compose_dir(),
         }
     }
 }