Add AGENTS.md guidance

Co-authored-by: it_cp_oscar <it_cp_oscar@meituan.com>

AGENTS.md

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+# AGENTS.md
+
+This file provides quick guidance for automated agents working in this repo.
+
+## Project layout
+- Root `pom.xml` is an aggregator (packaging: `pom`).
+- `yudao-server` is the main Spring Boot app.
+- `yudao-framework` and `yudao-module-*` are backend modules.
+- `yudao-ui/*` contains frontend apps (separate build toolchains).
+
+## Requirements
+- JDK 8 (see `pom.xml` -> `java.version=1.8`).
+- Maven 3.8+.
+
+## Build
+- Build all modules without tests:
+  - `mvn -DskipTests package`
+- Build a specific module and its dependencies:
+  - `mvn -pl yudao-server -am package`
+
+## Test
+- Run tests for a module:
+  - `mvn -pl yudao-server -am test`
+  - `mvn -pl yudao-module-system -am test`
+
+## Run (server)
+- `mvn -pl yudao-server -am spring-boot:run`
+- Or run `YudaoServerApplication` in your IDE.
+
+## Notes
+- Several optional modules are commented out in root `pom.xml`; uncomment to include them.
+- Server config files live in `yudao-server/src/main/resources/application*.yaml`.