chore: GitHub workflow revamp — GitHub Flow, community files, CI updates (#101)

* chore: add comprehensive .gitignore

* ci: update CI workflow for GitHub Flow

- Change triggers from develop to main (PRs to main + pushes to main)
- Add concurrency controls to cancel stale runs
- Update docker/build-push-action to v6
- Add descriptive job names for branch protection status checks
- Update screenshot refresh and docs sync to trigger on main pushes

* ci: update docker-publish for GitHub Flow

- Remove develop branch trigger (no more dev tag)
- Keep v* tag trigger for releases
- Update docker/build-push-action to v6

* docs: add community and governance files

- CONTRIBUTING.md with dev setup and PR guidelines
- SECURITY.md with vulnerability reporting policy
- CODE_OF_CONDUCT.md (Contributor Covenant v2.1 reference)
- PR template with conventional commits checklist
- Issue templates for bug reports and feature requests
- CODEOWNERS defaulting to @AnsoCode
- Dependabot config for npm (root, backend, frontend) and GitHub Actions

* docs: add README with badges, quick start, and contributing section

* chore: add LICENSE placeholder and open license decision issue (#100)

* docs: update CLAUDE.md for GitHub Flow branching model

- Replace develop-based Git Flow with GitHub Flow (main only)
- All branches now created off main, PRs target main
- Simplify release checklist (no develop-to-main merge step)
- Update testing strategy to reference Vitest and Playwright
- Fix docs.json reference (was mint.json)

* chore: track CLAUDE.md in version control

Remove CLAUDE.md from .gitignore so project workflow instructions
are versioned alongside the code they govern.

* docs: add MANUAL_STEPS.md for GitHub settings that require UI configuration

.github/workflows/docker-publish.yml

@@ -2,8 +2,6 @@ name: Build and Publish Docker Image
 
 on:
   push:
-    branches:
-      - develop
     tags:
       - 'v*'
   workflow_dispatch:
@@ -36,14 +34,11 @@ jobs:
         with:
           images: saelix/sencho
           tags: |
-            # If pushing to develop, tag as 'dev'
-            type=raw,value=dev,enable=${{ github.ref == 'refs/heads/develop' }}
-            # If pushing a v* tag, tag as 'latest' and the specific semver version
             type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
             type=semver,pattern={{version}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true