feat: add release-please for template versioning

Author: gracefullight

.github/workflows/release-please.yml

@@ -0,0 +1,18 @@
+name: release-please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          release-type: simple

README.ko.md

@@ -2,9 +2,12 @@
 
 [![GitHub Repo stars](https://img.shields.io/github/stars/first-fluke/fullstack-starter?logo=githubsponsors)](https://github.com/first-fluke/fullstack-starter/stargazers)
 [![Last Commit](https://img.shields.io/github/last-commit/first-fluke/fullstack-starter/main?label=last%20updated&logo=github&logoColor=white)](https://github.com/first-fluke/fullstack-starter)
+[![Version](https://img.shields.io/github/v/release/first-fluke/fullstack-starter?label=version)](https://github.com/first-fluke/fullstack-starter/releases)
 
 [English](./README.md) | 한국어
 
+> 템플릿 버전은 [Release Please](https://github.com/googleapis/release-please)로 관리됩니다 — [CHANGELOG.md](./CHANGELOG.md)에서 릴리즈 히스토리를 확인하세요.
+
 실무에 바로 적용 가능한 풀스택 모노레포 템플릿입니다. Next.js 16, FastAPI, Flutter, GCP 인프라가 통합되어 있습니다.
 
 ### 3-Tier Architecture (3계층 아키텍처)

README.md

@@ -2,9 +2,12 @@
 
 [![GitHub Repo stars](https://img.shields.io/github/stars/first-fluke/fullstack-starter?logo=githubsponsors)](https://github.com/first-fluke/fullstack-starter/stargazers)
 [![Last Commit](https://img.shields.io/github/last-commit/first-fluke/fullstack-starter/main?label=last%20updated&logo=github&logoColor=white)](https://github.com/first-fluke/fullstack-starter)
+[![Version](https://img.shields.io/github/v/release/first-fluke/fullstack-starter?label=version)](https://github.com/first-fluke/fullstack-starter/releases)
 
 English | [한국어](./README.ko.md)
 
+> Template versioning via [Release Please](https://github.com/googleapis/release-please) — see [CHANGELOG.md](./CHANGELOG.md) for release history.
+
 Production-ready fullstack monorepo template with Next.js 16, FastAPI, Flutter, and GCP infrastructure.
 
 ### 3-Tier Architecture

version.txt

@@ -0,0 +1 @@
+1.0.0