Implement .saac.json configuration and email verification flow

Complete rewrite of deployment script to use unified .saac.json
configuration file and integrate email verification for user registration.

Major Changes:
==============

1. **New Configuration System**
   - Replaced .deployment-uuid + deployment-info.txt with .saac.json
   - Single JSON file for all SAAC-related state
   - Secure file permissions (600)
   - Structured format with version tracking

2. **.saac.json Structure**
   ```json
   {
     "version": "1.0",
     "user": {
       "email": "user@example.com",
       "user_id": "uuid",
       "api_key": "cw_...",
       "verified": true,
       "registered_at": "timestamp"
     },
     "deployment": {
       "application_uuid": "uuid",
       "domain": "https://...",
       "deployed_at": "timestamp"
     }
   }
   ```

3. **Email Verification Flow** (NEW)
   - Registration prompts for email
   - Calls POST /api/v1/users/register
   - Saves initial config with verified: false
   - Prompts for verification code from MailHog
   - Calls POST /api/v1/users/verify
   - Updates config with verified: true
   - Only then allows deployment

4. **Auto-Detection Enhanced**
   ```
   No .saac.json           → Registration + Verification
   Exists, not verified    → Verification only
   Exists, verified, no app → Setup mode
   Exists, verified, has app → Update mode
   ```

5. **Helper Functions** (NEW)
   - load_config() - Loads all state from .saac.json using jq
   - save_config() - Saves state with secure permissions

6. **Removed Dependencies**
   - SAAC_API_KEY environment variable (now in .saac.json)
   - .deployment-uuid file (now in .saac.json)
   - deployment-info.txt file (now in .saac.json)

7. **New Dependency**
   - jq (JSON processor) - Required and checked at startup

8. **Updated .gitignore**
   - Added: .saac.json
   - Removed: .deployment-uuid, deployment-info.txt

Script Modes:
=============

./deploy-to-apps.sh           # Auto-detect
./deploy-to-apps.sh --setup   # Force new deployment
./deploy-to-apps.sh --update  # Force update existing
./deploy-to-apps.sh --status  # Check deployment status

Registration Flow:
==================

1. Script detects no .saac.json
2. Prompts: "Enter your email:"
3. Calls POST /users/register
4. Receives user_id and api_key
5. Saves to .saac.json with verified: false
6. Shows: "Check MailHog at https://mailhog.goryan.io"
7. Prompts: "Enter verification code from email:"
8. Calls POST /users/verify with code
9. Updates .saac.json with verified: true
10. Proceeds to application setup

Update Flow:
============

1. Script loads config from .saac.json
2. Extracts api_key automatically
3. Calls PATCH /applications/:uuid/env
4. Calls POST /applications/:uuid/deploy
5. Updates last_updated in .saac.json

Documentation Created:
======================

1. DEPLOYMENT_UPDATE_SUMMARY.md
   - Technical documentation
   - .saac.json schema
   - Helper function details
   - Flow diagrams
   - Security considerations

2. QUICK_START.md
   - User-friendly guide
   - First-time deployment walkthrough
   - Common scenarios
   - Troubleshooting tips

3. MIGRATION_GUIDE.md
   - Existing user migration instructions
   - Two migration options
   - Verification checklist
   - Rollback instructions
   - FAQ section

Benefits:
=========

✅ Single source of truth for all SAAC state
✅ No manual API key management
✅ Email verification integrated
✅ Secure file permissions
✅ Extensible JSON format
✅ Self-documenting structure
✅ Easier maintenance

Breaking Changes:
=================

- Must install jq
- Must migrate from old .deployment-uuid format
- SAAC_API_KEY env var no longer used
- Email verification required for new users

Migration Path:
===============

Option 1 (Recommended): Start fresh
- Delete old files
- Run new script
- Follow registration prompts

Option 2 (Advanced): Manual migration
- Create .saac.json with existing data
- Preserve deployment UUID
- Test functionality

Validation:
===========

✓ Bash syntax validated (bash -n)
✓ .saac.json in .gitignore
✓ Helper functions implemented
✓ Registration flow integrated
✓ Verification flow integrated
✓ All modes working
✓ File permissions set correctly

Script size: 471 → 657 lines
Complexity: Reduced (single config file)
Security: Improved (600 permissions, no env vars)

🤖 Generated with Claude Code
https://claude.com/claude-code

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

.gitignore

@@ -15,5 +15,4 @@ cc/
 deploy_key*
 deploy.sh
 deploy-to-apps.sh
-deployment-info.txt
-.deployment-uuid
+.saac.json