feat: add interactive setup wizard with API validation and mismatch detection

Major improvements to plugin setup experience:

Setup Commands:
- Redesign /initial-setup as interactive wizard (MCP + system + project config)
- Add /project-init for quick project-only setup
- Add /project-sync for handling repository moves/renames
- Add Gitea API validation to auto-fill org/repo when verified

Configuration Changes:
- Move GITEA_ORG from system to project level (supports multi-org users)
- System config now only contains GITEA_URL and GITEA_TOKEN
- Project .env now contains GITEA_ORG and GITEA_REPO

Automation:
- Add SessionStart hook for projman and pr-review
- Automatically detects git remote vs .env mismatch
- Warns user to run /project-sync when mismatch found

Documentation:
- Unify configuration docs (remove duplicate in plugins/projman)
- Add flow diagrams to CONFIGURATION.md
- Add setup script review guidance to UPDATING.md
- Update COMMANDS-CHEATSHEET.md with new commands and hooks

Files added:
- plugins/projman/commands/project-init.md
- plugins/projman/commands/project-sync.md
- plugins/projman/hooks/hooks.json
- plugins/pr-review/commands/initial-setup.md
- plugins/pr-review/commands/project-init.md
- plugins/pr-review/commands/project-sync.md
- plugins/pr-review/hooks/hooks.json
- plugins/cmdb-assistant/commands/initial-setup.md

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

plugins/projman/CONFIGURATION.md

@@ -1,39 +1,10 @@
-# Configuration Guide - Projman Plugin
+# Configuration - Projman Plugin
 
-For comprehensive configuration instructions, see the **[Centralized Configuration Guide](../../docs/CONFIGURATION.md)**.
+See **[docs/CONFIGURATION.md](../../docs/CONFIGURATION.md)** for complete setup instructions.
 
-## Quick Reference
+## Quick Commands
 
-### Required Configuration
-
-**System-level** (`~/.config/claude/gitea.env`):
-```bash
-GITEA_URL=https://gitea.example.com
-GITEA_TOKEN=your_token
-GITEA_ORG=your_organization
 ```
-
-**Project-level** (`.env` in project root):
-```bash
-GITEA_REPO=your-repo-name
+/initial-setup    # First time on this machine
+/project-init     # New project (system already configured)
 ```
-
-### MCP Server Installation
-
-```bash
-cd mcp-servers/gitea
-python3 -m venv .venv
-source .venv/bin/activate
-pip install -r requirements.txt
-```
-
-### Verification
-
-```bash
-/initial-setup
-/labels-sync
-```
-
----
-
-For detailed setup instructions, troubleshooting, and security best practices, see [docs/CONFIGURATION.md](../../docs/CONFIGURATION.md).