feat(a0): 完成工程骨架与契约基线

- 建立 pnpm workspace + Turborepo 单仓、ESLint 9/Prettier/commitlint/husky 门禁
- NestJS + Fastify API：统一错误体、trace_id、Zod 管道、/health 真实依赖探活、OpenAPI 3.1 契约
- Prisma 基线：outbox_events/idempotency_keys/system_configs 与首版迁移、幂等种子
- shared 契约包：错误码、权限点、ULID、游标分页、命名/时间工具
- ui 包与 Web 壳层：Semi + Remix 图标统一出口、Cloud Blue 视觉、登录/工作台/错误页
- worker 骨架、Playwright 冒烟、Gitea CI、OpenAPI 快照与 oasdiff 回退脚本
- 补充 A0 实施报告与本地开发说明

prisma/migrations/20261102083445_init_platform_baseline/migration.sql

@@ -0,0 +1,60 @@
+-- CreateTable
+CREATE TABLE "outbox_events" (
+    "id" CHAR(26) NOT NULL,
+    "aggregate_type" VARCHAR(64) NOT NULL,
+    "aggregate_id" CHAR(26) NOT NULL,
+    "event_type" VARCHAR(128) NOT NULL,
+    "payload_json" JSONB NOT NULL,
+    "trace_id" VARCHAR(64),
+    "occurred_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "published_at" TIMESTAMPTZ(3),
+    "attempts" INTEGER NOT NULL DEFAULT 0,
+    "last_error" TEXT,
+
+    CONSTRAINT "outbox_events_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "idempotency_keys" (
+    "id" CHAR(26) NOT NULL,
+    "scope" VARCHAR(64) NOT NULL,
+    "key" VARCHAR(128) NOT NULL,
+    "request_hash" VARCHAR(64) NOT NULL,
+    "response_status" INTEGER,
+    "response_body" JSONB,
+    "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "expires_at" TIMESTAMPTZ(3) NOT NULL,
+
+    CONSTRAINT "idempotency_keys_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "system_configs" (
+    "id" CHAR(26) NOT NULL,
+    "config_key" VARCHAR(128) NOT NULL,
+    "config_value" JSONB NOT NULL,
+    "value_type" VARCHAR(16) NOT NULL,
+    "description" VARCHAR(255) NOT NULL DEFAULT '',
+    "version" INTEGER NOT NULL DEFAULT 1,
+    "is_editable" BOOLEAN NOT NULL DEFAULT true,
+    "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMPTZ(3) NOT NULL,
+    "updated_by" CHAR(26),
+
+    CONSTRAINT "system_configs_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "outbox_events_published_at_occurred_at_idx" ON "outbox_events"("published_at", "occurred_at");
+
+-- CreateIndex
+CREATE INDEX "outbox_events_aggregate_type_aggregate_id_idx" ON "outbox_events"("aggregate_type", "aggregate_id");
+
+-- CreateIndex
+CREATE INDEX "idempotency_keys_expires_at_idx" ON "idempotency_keys"("expires_at");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "idempotency_keys_scope_key_key" ON "idempotency_keys"("scope", "key");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "system_configs_config_key_key" ON "system_configs"("config_key");