feat(crm): persist contact data imports

migrations/000020_add_data_imports.down.sql

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+DROP TABLE IF EXISTS data_imports;

migrations/000020_add_data_imports.up.sql

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+CREATE TABLE IF NOT EXISTS data_imports (
+  id INTEGER PRIMARY KEY,
+  account_id INTEGER NOT NULL,
+  user_id INTEGER,
+  data_type VARCHAR(100) NOT NULL,
+  status VARCHAR(50) NOT NULL DEFAULT 'pending',
+  total_records INTEGER NOT NULL DEFAULT 0,
+  processed_records INTEGER NOT NULL DEFAULT 0,
+  failed_records INTEGER NOT NULL DEFAULT 0,
+  processing_errors TEXT,
+  import_config JSONB DEFAULT '{}',
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  deleted_at TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_data_imports_account_id ON data_imports(account_id);
+CREATE INDEX IF NOT EXISTS idx_data_imports_deleted_at ON data_imports(deleted_at);
+CREATE INDEX IF NOT EXISTS idx_data_imports_user_id ON data_imports(user_id);