feat: sync quick add ingestion updates

- simplify quick add source selection and fallback saving
- improve description context and manual edit behavior
- add extractor dimension filtering and edge explanation migration

apps/mcp-server-standalone/services/sqlite-client.js

@@ -70,6 +70,7 @@ function initDatabase() {
         source TEXT,
         created_at TEXT,
         context TEXT,
+        explanation TEXT,
         FOREIGN KEY (from_node_id) REFERENCES nodes(id) ON DELETE CASCADE,
         FOREIGN KEY (to_node_id) REFERENCES nodes(id) ON DELETE CASCADE
       );
@@ -112,6 +113,18 @@ function initDatabase() {
   db.pragma('cache_size = 5000');
   db.pragma('busy_timeout = 5000');
 
+  const edgeCols = db.prepare('PRAGMA table_info(edges)').all().map(c => c.name);
+  if (!edgeCols.includes('explanation')) {
+    db.exec('ALTER TABLE edges ADD COLUMN explanation TEXT;');
+    try {
+      db.exec(`
+        UPDATE edges SET explanation = json_extract(context, '$.explanation')
+        WHERE explanation IS NULL AND json_extract(context, '$.explanation') IS NOT NULL;
+      `);
+    } catch {}
+    console.error('[RA-H] Migrated edges: added explanation column');
+  }
+
   return db;
 }