feat(migrations): Harden task audit tracking and optimize article templates

- Added migration to harden task audit tracking by modifying audit_logs and related tables.
- Introduced operator_id to several tables for better tracking of actions.
- Updated article_templates with new prompt templates for various article types, enhancing content generation.
- Created prompt_rules and schedule_tasks tables to manage content generation rules and scheduling.
- Added foreign key constraints to articles for better data integrity.

server/migrations/20260401143000_harden_task_audit_tracking.up.sql

@@ -0,0 +1,49 @@
+ALTER TABLE generation_tasks
+    ADD COLUMN operator_id BIGINT REFERENCES users(id);
+
+ALTER TABLE template_assist_tasks
+    ADD COLUMN operator_id BIGINT REFERENCES users(id);
+
+ALTER TABLE task_records
+    ADD COLUMN operator_id BIGINT REFERENCES users(id);
+
+ALTER TABLE tenant_quota_ledgers
+    ADD COLUMN operator_id BIGINT REFERENCES users(id);
+
+ALTER TABLE quota_reservations
+    ADD COLUMN operator_id BIGINT REFERENCES users(id),
+    ALTER COLUMN resource_id DROP NOT NULL;
+
+ALTER TABLE audit_logs
+    ADD COLUMN resource_type VARCHAR(50),
+    ADD COLUMN resource_id BIGINT,
+    ADD COLUMN request_id VARCHAR(64),
+    ADD COLUMN error_message TEXT;
+
+CREATE INDEX idx_generation_task_tenant_operator_created
+    ON generation_tasks(tenant_id, operator_id, created_at DESC);
+
+CREATE INDEX idx_template_assist_tasks_tenant_operator_created
+    ON template_assist_tasks(tenant_id, operator_id, created_at DESC);
+
+CREATE INDEX idx_task_record_tenant_operator_created
+    ON task_records(tenant_id, operator_id, created_at DESC);
+
+CREATE INDEX idx_quota_ledgers_tenant_operator_created
+    ON tenant_quota_ledgers(tenant_id, operator_id, created_at DESC);
+
+CREATE INDEX idx_quota_reservations_tenant_operator_created
+    ON quota_reservations(tenant_id, operator_id, created_at DESC);
+
+CREATE INDEX idx_audit_tenant_operator_created
+    ON audit_logs(tenant_id, operator_id, created_at DESC);
+
+DROP INDEX IF EXISTS uk_template_scope_key_version_active;
+
+CREATE UNIQUE INDEX uk_template_platform_key_version_active
+    ON article_templates(scope, template_key, version_no)
+    WHERE deleted_at IS NULL AND tenant_id IS NULL;
+
+CREATE UNIQUE INDEX uk_template_tenant_key_version_active
+    ON article_templates(scope, tenant_id, template_key, version_no)
+    WHERE deleted_at IS NULL AND tenant_id IS NOT NULL;