feat(crm): complete contact label avatar gaps

migrations/000019_add_contact_labels.down.sql

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+DROP TABLE IF EXISTS contact_labels;

migrations/000019_add_contact_labels.up.sql

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+CREATE TABLE IF NOT EXISTS contact_labels (
+  contact_id INTEGER NOT NULL,
+  tag_id INTEGER NOT NULL,
+  account_id INTEGER NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (contact_id, tag_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_contact_labels_contact_id ON contact_labels(contact_id);
+CREATE INDEX IF NOT EXISTS idx_contact_labels_tag_id ON contact_labels(tag_id);
+CREATE INDEX IF NOT EXISTS idx_contact_labels_account_id ON contact_labels(account_id);