feat: update core API, database layer, and worker modules

- Remove unused imports (n8n_search, universal_search, Client, Arc, etc.)
- Update API endpoints for identity, face recognition, search
- Fix postgres_db.rs search_videos parent_uuid column
- Add snapshot API and identity agent API
- Clean up backup files (.bak, .bak2)

src/core/config.rs

@@ -165,6 +165,42 @@ pub mod cache {
     });
 }
 
+pub mod snapshot {
+    use super::*;
+
+    pub static SNAPSHOT_DIR_NAME: Lazy<String> = Lazy::new(|| {
+        env::var("MOMENTRY_SNAPSHOT_DIR_NAME").unwrap_or_else(|_| ".momentry_snapshots".to_string())
+    });
+
+    pub static HOT_THRESHOLD: Lazy<u64> = Lazy::new(|| {
+        env::var("MOMENTRY_SNAPSHOT_HOT_THRESHOLD")
+            .unwrap_or_else(|_| "5".to_string())
+            .parse()
+            .unwrap_or(5)
+    });
+
+    pub static HOT_TTL_SECS: Lazy<u64> = Lazy::new(|| {
+        env::var("MOMENTRY_SNAPSHOT_HOT_TTL_SECS")
+            .unwrap_or_else(|_| "86400".to_string())
+            .parse()
+            .unwrap_or(86400)
+    });
+
+    pub static WARM_TTL_SECS: Lazy<u64> = Lazy::new(|| {
+        env::var("MOMENTRY_SNAPSHOT_WARM_TTL_SECS")
+            .unwrap_or_else(|_| "604800".to_string())
+            .parse()
+            .unwrap_or(604800)
+    });
+
+    pub static GENERATING_TIMEOUT_SECS: Lazy<u64> = Lazy::new(|| {
+        env::var("MOMENTRY_SNAPSHOT_GENERATING_TIMEOUT")
+            .unwrap_or_else(|_| "1800".to_string())
+            .parse()
+            .unwrap_or(1800)
+    });
+}
+
 pub mod llm {
     use super::*;