refactor: move Gradle wrapper to repo root, add convenience tasks

Move gradlew, gradle/wrapper, and settings.gradle from backend/ to
the repo root so build commands run from the top-level directory.
This follows the standard multi-project Gradle layout where the build
tool lives alongside docker-compose.yml and all submodules.

- Move gradlew + gradle/wrapper/* from backend/ to repo root
- Move settings.gradle to root with rootProject.name and include 'backend'
- Create root build.gradle with convenience tasks: check, up, down, reset
- check task chains frontend lint → frontend test → backend check
- Update docker-compose.yml backend volume from ./backend:/app to .:/app
- Update backend.Dockerfile entrypoint to ./gradlew :backend:bootRun
- Update AGENTS.md: document ./gradlew check, up, down, reset
- Delete backend/settings.gradle (now at root)
- Add .gradle/ and build/ to .gitignore
- Add !gradle/wrapper/gradle-wrapper.jar exception (blocked by *.jar rule)

All 38 frontend tests and 33 backend tests pass via ./gradlew check.

.gitignore

@@ -39,6 +39,10 @@ Thumbs.db
 docker-compose.override.yml
 certs/
 
+# Gradle
+.gradle/
+build/
+
 # Java
 *.hprof
 

AGENTS.md

@@ -24,11 +24,23 @@ PostgreSQL 16. Deployed via Docker Compose.
 
 Always run these after making changes to verify nothing is broken.
 
+Gradle lives at repo root. All commands below run from the repo root unless noted.
+
 ### Quick start (everything)
 
 ```bash
 cp .env.example .env    # first time only, then fill in keys
 docker compose up -d    # starts postgres, backend, frontend
+./gradlew up            # same as above (Gradle wrapper)
+```
+
+### All-in-one
+
+```bash
+./gradlew check         # frontend lint → frontend test → backend test → integration test
+./gradlew up            # docker compose up -d
+./gradlew down          # docker compose down
+./gradlew reset         # docker compose down -v && docker compose up -d (full DB reset)
 ```
 
 ### Frontend (Vue.js 3 + Vite)
@@ -45,10 +57,8 @@ npm run test         # vitest
 ### Backend (Spring Boot 4 + Java 21)
 
 ```bash
-cd backend
-./gradlew bootRun    # dev server on :8080
-./gradlew test               # JUnit 5 + Mockito
-./gradlew check             # full verification including integration tests
+./gradlew :backend:bootRun    # dev server on :8080
+./gradlew :backend:test       # JUnit 5 + Mockito (backend only)
 ```
 
 ### Stripe webhooks (local testing)
@@ -80,7 +90,8 @@ bilhej/
 │   │   ├── router/          # Vue Router config
 │   │   └── assets/          # Static files, CSS
 │   └── ...
-├── backend/                 # Spring Boot 4 (Java 21)
+├── backend/                 # Spring Boot 4 (Java 21) — Gradle subproject
+│   ├── build.gradle              # Spring Boot plugin, Java deps, test config
 │   ├── src/main/java/se/bilhalsning/
 │   │   ├── config/          # @Configuration classes
 │   │   ├── controller/      # REST controllers
@@ -96,7 +107,7 @@ bilhej/
 │       ├── application-docker.yml     # docker profile (PostgreSQL)
 │       └── db/migration/              # Flyway migrations
 ├── docker/                  # Dockerfiles
-│   ├── backend.Dockerfile              # dev: JDK 21 + gradle bootRun
+│   ├── backend.Dockerfile              # dev: JDK 21 + gradle :backend:bootRun
 │   ├── backend.prod.Dockerfile         # prod: multi-stage (Gradle build → JRE Alpine, non-root)
 │   ├── frontend.Dockerfile             # dev: Node 24 + vite dev server
 │   ├── frontend.prod.Dockerfile        # prod: multi-stage (Node build → nginx)
@@ -104,6 +115,11 @@ bilhej/
 │   └── entrypoint.sh                   # prod: self-signed cert generation
 ├── docker-compose.yml       # dev: postgres + backend (bootRun) + frontend (Vite HMR)
 ├── docker-compose.prod.yml  # prod: multi-stage images, no source mounts, restart always
+├── gradlew                  # Gradle wrapper (repo root)
+├── gradle/
+│   └── wrapper/
+├── settings.gradle          # rootProject.name + include 'backend'
+├── build.gradle             # convenience tasks: check, up, down, reset
 ├── .env.example
 ├── AGENTS.md                # This file
 ├── README.md

build.gradle

@@ -0,0 +1,38 @@
+plugins {
+    id 'base'
+}
+
+tasks.register('frontendLint', Exec) {
+    description = 'Run ESLint in the frontend directory'
+    workingDir = file("${rootProject.projectDir}/frontend")
+    commandLine 'npm', 'run', 'lint'
+}
+
+tasks.register('frontendTest', Exec) {
+    description = 'Run Vitest in the frontend directory'
+    dependsOn frontendLint
+    workingDir = file("${rootProject.projectDir}/frontend")
+    commandLine 'npm', 'run', 'test'
+}
+
+tasks.named('check').configure {
+    dependsOn frontendLint, frontendTest
+}
+
+tasks.register('up', Exec) {
+    description = 'Start all services via Docker Compose'
+    workingDir = rootProject.projectDir
+    commandLine 'docker', 'compose', 'up', '-d'
+}
+
+tasks.register('down', Exec) {
+    description = 'Stop all Docker Compose services'
+    workingDir = rootProject.projectDir
+    commandLine 'docker', 'compose', 'down'
+}
+
+tasks.register('reset', Exec) {
+    description = 'Wipe database and restart all services'
+    workingDir = rootProject.projectDir
+    commandLine 'bash', '-c', 'docker compose down -v && docker compose up -d'
+}

docker-compose.yml

@@ -36,7 +36,7 @@ services:
       postgres:
         condition: service_healthy
     volumes:
-      - ./backend:/app
+      - .:/app
       - gradle-cache:/root/.gradle
 
   frontend:

docker/backend.Dockerfile

@@ -1,3 +1,3 @@
 FROM eclipse-temurin:21-jdk
 WORKDIR /app
-ENTRYPOINT ["./gradlew", "bootRun", "--no-daemon"]
+ENTRYPOINT ["./gradlew", ":backend:bootRun", "--no-daemon"]

settings.gradle

@@ -1 +1,3 @@
 rootProject.name = 'bilhej'
+
+include 'backend'