feat(git-flow): add /gitflow setup with auto-config and CLAUDE.md injection

New gitflow-setup.md command auto-detects Gitea system config from
~/.config/claude/gitea.env, configures workflow settings, and injects
Git Workflow section into project CLAUDE.md. Moved
claude-md-integration.md to skills/ for programmatic use.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/git-flow/skills/claude-md-integration.md

@@ -0,0 +1,70 @@
+# CLAUDE.md Git-Flow Section Template
+
+## Purpose
+
+Template for the Git Workflow section that `/gitflow setup` injects into a project's CLAUDE.md.
+
+## When to Use
+
+- During `/gitflow setup` to inject the Git Workflow section
+- As reference for the expected CLAUDE.md structure
+
+## Template
+
+The following template uses placeholders that `/gitflow setup` replaces with actual values:
+
+```markdown
+## Git Workflow
+
+This project uses the git-flow plugin for git operations.
+
+### Workflow Style
+
+**Style:** {GIT_WORKFLOW_STYLE}
+**Base Branch:** {GIT_DEFAULT_BASE}
+
+### Branch Naming
+
+Use the format: `<type>/<description>`
+
+Types: feat, fix, chore, docs, refactor, test, perf
+
+Examples:
+- `feat/add-user-auth`
+- `fix/login-timeout`
+- `chore/update-deps`
+
+### Commit Messages
+
+Use conventional commits:
+
+```
+<type>(<scope>): <description>
+
+[body]
+
+[footer]
+```
+
+### Commands
+
+| Command | Use Case |
+|---------|----------|
+| `/gitflow commit` | Smart commit with optional --push, --merge, --sync |
+| `/gitflow commit --push` | Commit and push to remote |
+| `/gitflow commit --merge` | Commit and merge into target branch |
+| `/gitflow branch-start` | Start new branch |
+| `/gitflow status` | Enhanced status |
+
+### Protected Branches
+
+Do not commit directly to: {GIT_PROTECTED_BRANCHES}
+```
+
+## Placeholder Reference
+
+| Placeholder | Source | Default |
+|-------------|--------|---------|
+| `{GIT_WORKFLOW_STYLE}` | Step 5 selection | `feature-branch` |
+| `{GIT_DEFAULT_BASE}` | Step 5 selection | `development` |
+| `{GIT_PROTECTED_BRANCHES}` | Step 5 selection | `main,staging` |