feat(phase1): OpenRouter采集器接入PostgreSQL，数据链路闭环

- 将 fetch_openrouter.go 的 summarize() 实现为 PostgreSQL upsert
- 新增 -db 参数和 DATABASE_URL 环境变量支持
- 打通 models + model_prices 表的最小可运行链路
- 创建 llm_intelligence 数据库并运行 migration
- 前端 Explorer 验证 T-3.2~T-3.5 全部通过
- 日报生成器正常产出 Markdown 和 latest_models.json

Makefile

@@ -0,0 +1,22 @@
+.PHONY: build-fetch-openrouter check-fetch-openrouter ci-fetch-openrouter help-fetch-openrouter test-fetch-openrouter
+
+test-fetch-openrouter:
+	bash $(CURDIR)/scripts/test.sh
+
+build-fetch-openrouter: scripts/fetch_openrouter.go
+	go build -o /dev/null ./scripts/fetch_openrouter.go
+
+ci-fetch-openrouter: build-fetch-openrouter test-fetch-openrouter
+
+check-fetch-openrouter: ci-fetch-openrouter
+	test -x scripts/test.sh
+	test -f scripts/fetch_openrouter.go
+	test -f scripts/testdata/openrouter_models_sample.json
+
+help-fetch-openrouter:
+	@printf "%-29s %s\n" "fetch-openrouter Makefile 入口" ""
+	@printf "%-29s %s\n" "make build-fetch-openrouter" "编译采集器（仅构建，无测试）"
+	@printf "%-29s %s\n" "make test-fetch-openrouter" "执行单元测试（仅测试，无构建）"
+	@printf "%-29s %s\n" "make ci-fetch-openrouter" "构建 + 测试（全链路）"
+	@printf "%-29s %s\n" "make check-fetch-openrouter" "CI 检查：构建 + 测试 + 产物验证"
+	@printf "%-29s %s\n" "make help-fetch-openrouter" "显示本帮助信息"