Add automated setup system for easy installation

- Add setup.sh interactive wizard for 5-minute setup
- Add INSTALL.md comprehensive installation guide
- Add templates/workflows/ directory with parameterized workflow templates
- Update README.md with prominent Installation section
- Update docs/README.md with installation links

The setup wizard automates:
- Platform selection (Gitea/GitHub)
- Bot configuration
- LLM provider setup
- Workflow file generation
- Configuration file creation

Users can now add OpenRabbit to any repository in under 5 minutes.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

templates/workflows/ai-chat.yml

@@ -0,0 +1,61 @@
+name: AI Chat ({{BOT_USERNAME}})
+
+# WORKFLOW ROUTING:
+# This workflow handles FREE-FORM questions/chat (no specific command)
+# Other workflows: ai-issue-triage.yml (@{{BOT_NAME}} triage), ai-comment-reply.yml (specific commands)
+# This is the FALLBACK for any @{{BOT_NAME}} mention that isn't a known command
+
+on:
+    issue_comment:
+        types: [created]
+
+# CUSTOMIZE YOUR BOT NAME:
+# Change '@{{BOT_NAME}}' in all conditions below to match your config.yml mention_prefix
+# Examples: '@bartender', '@uni', '@joey', '@codebot'
+
+jobs:
+    ai-chat:
+        # Only run if comment mentions the bot but NOT a specific command
+        # This prevents duplicate runs with ai-comment-reply.yml and ai-issue-triage.yml
+        # CRITICAL: Ignore bot's own comments to prevent infinite loops (bot username: {{BOT_USERNAME}})
+        if: |
+            {{PLATFORM}}.event.comment.user.login != '{{BOT_USERNAME}}' &&
+            contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}}') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} triage') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} help') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} explain') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} suggest') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} security') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} summarize') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} changelog') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} explain-diff') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} review-again') &&
+            !contains({{PLATFORM}}.event.comment.body, '@{{BOT_NAME}} setup-labels')
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+
+            - uses: actions/checkout@v4
+              with:
+                  repository: {{OPENRABBIT_REPO}}
+                  path: .ai-review
+                  token: ${{ secrets.AI_REVIEW_TOKEN }}
+
+            - uses: actions/setup-python@v5
+              with:
+                  python-version: "3.11"
+
+            - run: pip install requests pyyaml
+
+            - name: Run AI Chat
+              env:
+                  AI_REVIEW_TOKEN: ${{ secrets.AI_REVIEW_TOKEN }}
+                  AI_REVIEW_REPO: ${{ {{PLATFORM}}.repository }}
+                  AI_REVIEW_API_URL: {{API_URL}}
+                  OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+                  OPENROUTER_API_KEY: ${{ secrets.OPENROUTER_API_KEY }}
+                  OLLAMA_HOST: ${{ secrets.OLLAMA_HOST }}
+                  SEARXNG_URL: ${{ secrets.SEARXNG_URL }}
+              run: |
+                  cd .ai-review/tools/ai-review
+                  python main.py comment ${{ {{PLATFORM}}.repository }} ${{ {{PLATFORM}}.event.issue.number }} "${{ {{PLATFORM}}.event.comment.body }}"