docs: add AGENTS.md knowledge base files

springboot-backend/AGENTS.md

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+# SPRINGBOOT BACKEND KNOWLEDGE BASE
+
+## OVERVIEW
+Admin API for Flux Panel. Manages users, licenses, and traffic rules.
+**Stack:** Java 21, Spring Boot 2.7.18, SQLite, MyBatis Plus.
+
+## STRUCTURE
+```
+springboot-backend/
+├── src/main/java/com/admin/
+│   ├── controller/      # API Endpoints
+│   ├── entity/          # DB Models (MyBatis Plus)
+│   ├── mapper/          # Data Access
+│   ├── service/         # Business Logic
+│   └── common/          # Utils, DTOs
+└── src/main/resources/
+    ├── application.yml  # Config
+    ├── mapper/          # XML Mappers
+    ├── data.sql         # Init data
+    └── bgimages/        # Static resources
+```
+
+## CONVENTIONS
+- **DB**: SQLite used via `sqlite-jdbc`.
+- **ORM**: MyBatis Plus + MyBatis Plus Join.
+- **JSON**: FastJSON2 used for serialization.
+- **Utils**: Hutool used extensively.
+- **Auth**: Likely custom or token-based (see `controller` logic).
+
+## COMMANDS
+```bash
+# Build
+mvn clean package
+
+# Run
+java -jar target/admin-0.0.1-SNAPSHOT.jar
+```