feat: contacts sync — add all missing fields + UDFs

Migration 057:
- ADD user_defined_fields JSONB (GIN indexed)
- ADD middle_initial, note, external_id, country_id, company_location_id
- ADD create_date, impersonator_creator_resource_id
- ADD is_opted_out_from_bulk_email, bulk_email_opt_out_time
- ADD solicitation_opt_out_time, survey_opt_out
- ADD receives_email_notifications, billing_contact

entity-mapper.ts mapContact():
- Fix broken snake_case field refs → correct camelCase API names:
  alternate_phone → alternatePhone, mobile_phone → mobilePhone
  name_prefix/suffix → namePrefix/nameSuffix
  facebook/twitter/linkedin_url → facebookUrl/twitterUrl/linkedInUrl
  primary_contact → primaryContact, solicitation_opt_out → solicitationOptOut
  last_activity/modified_date → lastActivityDate/lastModifiedDate
  api_vendor_id → apiVendorID, is_active → isActive, is_deleted → isDeleted
- Add UDF conversion: userDefinedFields[] → JSONB {name: value}
- 17 UDFs stored: UserID, Birthday, O365License, VIP User, Department,
  Password, Email Password, Archive Email, User System Profile, etc.

Results: 4234 contacts synced, 3318 with UDFs, 4140 with create_date

migrations/057_contacts_missing_fields.sql

@@ -0,0 +1,20 @@
+-- Migration 057: Add missing contacts fields + UDF storage
+
+ALTER TABLE contacts
+  ADD COLUMN IF NOT EXISTS user_defined_fields         JSONB,
+  ADD COLUMN IF NOT EXISTS middle_initial              VARCHAR(10),
+  ADD COLUMN IF NOT EXISTS note                        TEXT,
+  ADD COLUMN IF NOT EXISTS external_id                VARCHAR(50),
+  ADD COLUMN IF NOT EXISTS country_id                  INTEGER,
+  ADD COLUMN IF NOT EXISTS company_location_id         BIGINT,
+  ADD COLUMN IF NOT EXISTS create_date                 TIMESTAMP WITHOUT TIME ZONE,
+  ADD COLUMN IF NOT EXISTS is_opted_out_from_bulk_email BOOLEAN DEFAULT false,
+  ADD COLUMN IF NOT EXISTS bulk_email_opt_out_time     TIMESTAMP WITHOUT TIME ZONE,
+  ADD COLUMN IF NOT EXISTS solicitation_opt_out_time   TIMESTAMP WITHOUT TIME ZONE,
+  ADD COLUMN IF NOT EXISTS survey_opt_out              BOOLEAN DEFAULT false,
+  ADD COLUMN IF NOT EXISTS receives_email_notifications BOOLEAN DEFAULT true,
+  ADD COLUMN IF NOT EXISTS billing_contact             BOOLEAN DEFAULT false,
+  ADD COLUMN IF NOT EXISTS impersonator_creator_resource_id BIGINT;
+
+-- GIN index for UDF queries (e.g. find by UserID, O365License)
+CREATE INDEX IF NOT EXISTS idx_contacts_udfs ON contacts USING gin(user_defined_fields);