Initial project setup: CI, Docker & configs

Add project bootstrap for build, CI/CD, and local development. Introduces Maven Wrapper (mvnw, mvnw.cmd, .mvn/wrapper), multi-stage Dockerfile, docker-compose files (compose.yaml, docker-compose.dev.yml), .env, banner and README. Adds Gitea Actions workflow to build, test and push container images. Update application.yml (port -> 8090, virtual threads, API versioning, management/actuator/prometheus settings, Steam API config) and add application-dev.yml for local overrides. Extend pom.xml with caching, observability (actuator, micrometer/prometheus), testing/dev dependencies (testcontainers, devtools, additional spring test modules) to support CI and local testing.

docker-compose.dev.yml

@@ -0,0 +1,22 @@
+# docker-compose.dev.yml
+services:
+  # ─────────────────────────────────────────────
+  # LOCAL DATABASE FOR DEVELOPMENT
+  # ─────────────────────────────────────────────
+  tbp-db-local:
+    image: postgres:17-alpine
+    container_name: tbp_db_local
+    restart: unless-stopped
+    ports:
+      # Map the container port 5432 to your local machine port 5432
+      - "5432:5432"
+    environment:
+      - POSTGRES_DB=tbp_core
+      - POSTGRES_USER=tbp_user
+      - POSTGRES_PASSWORD=${DB_PASSWORD}
+    volumes:
+      # Use a local volume to persist data across container restarts
+      - tbp_local_db_data:/var/lib/postgresql/data
+
+volumes:
+  tbp_local_db_data: