fix(ui): 自定义工具表单 overflow-y-scroll→auto + 认证方式NONE翻译改为'无' + Captain文档爬虫/同步后端

backend/migrations/000062_captain_document_file_fields.down.sql

@@ -0,0 +1,4 @@
+ALTER TABLE captain_documents DROP COLUMN IF EXISTS file_size;
+ALTER TABLE captain_documents DROP COLUMN IF EXISTS content_type;
+ALTER TABLE captain_documents DROP COLUMN IF EXISTS file_url;
+ALTER TABLE captain_documents ALTER COLUMN external_link SET NOT NULL;

backend/migrations/000062_captain_document_file_fields.up.sql

@@ -0,0 +1,7 @@
+-- Add file upload metadata fields to captain_documents for PDF support
+ALTER TABLE captain_documents ADD COLUMN IF NOT EXISTS file_size BIGINT DEFAULT 0;
+ALTER TABLE captain_documents ADD COLUMN IF NOT EXISTS content_type VARCHAR(100) DEFAULT '';
+ALTER TABLE captain_documents ADD COLUMN IF NOT EXISTS file_url VARCHAR(2048) DEFAULT '';
+
+-- Allow external_link to be nullable (for direct content input documents)
+ALTER TABLE captain_documents ALTER COLUMN external_link DROP NOT NULL;