Add AI DEV Node deployment foundation

migrations/002_audit_log.sql

@@ -0,0 +1,15 @@
+-- Ported from backend/src/main/resources/db/migration/V2__audit_log.sql
+
+CREATE TABLE audit_logs (
+    id             BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    created_at     TIMESTAMP    NOT NULL,
+    updated_at     TIMESTAMP    NOT NULL,
+    actor_id       BIGINT,
+    actor_username VARCHAR(50),
+    action         VARCHAR(30)  NOT NULL,
+    target_type    VARCHAR(30),
+    target_id      BIGINT,
+    detail         VARCHAR(500)
+);
+CREATE INDEX idx_audit_created_at ON audit_logs (created_at);
+CREATE INDEX idx_audit_action ON audit_logs (action);