feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.
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# Format Information Placement Fix - Complete Analysis
## Problem Discovery
QR codes were technically correct (data placement, Reed-Solomon, all function patterns) but **completely unrecognizable** by scanner apps.
### Critical Test Result
- **Python Reference QR Code**: ✅ WORKS (user confirmed: "der python code funktioniert")
- **Our Implementation**: ❌ FAILED (user confirmed: "der andere nicht")
## Root Cause
Format Information horizontal placement was **INCORRECT**.
### What Was Wrong
**Before Fix:**
- Applied bit swap pattern `[0,1,2,3,4,5,6,7,8,10,9,11,13,12,14]` when WRITING
- This created DOUBLE swapping (once in bit order, once in column order)
- Result: Horizontal ≠ Vertical format info
```php
// ❌ WRONG - Double swapping
$bitIndices = [0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 9, 11, 13, 12, 14];
for ($i = 0; $i < 15; $i++) {
$bitIndex = $bitIndices[$i]; // First swap
$bit = ($formatBits >> (14 - $bitIndex)) & 1;
$matrix = $matrix->setModuleAt(8, $columns[$i], $module); // Second swap in column order
}
```
### The Fix
**After Fix:**
- Write bits SEQUENTIALLY (0-14)
- Let the COLUMN ORDER create the natural swap
- Result: Horizontal = Vertical format info ✅
```php
// ✅ CORRECT - Sequential placement
for ($i = 0; $i < 15; $i++) {
$bit = ($formatBits >> (14 - $i)) & 1; // Sequential bits
$module = $bit === 1 ? Module::dark() : Module::light();
$matrix = $matrix->setModuleAt(8, $columns[$i], $module); // Column order creates natural swap
}
```
## Technical Details
### Format Information Structure
- 15 bits total
- Bits 0-4: EC level + Mask pattern (5 data bits)
- Bits 5-14: BCH(15,5) error correction (10 parity bits)
- XOR mask: `101010000010010`
### Placement Columns (Horizontal)
```
[0, 1, 2, 3, 4, 5, 7, 8, 20, 19, 18, 17, 16, 15, 14]
^ ^ ↓- ↓- ↓- ↓- ↓- ↓- ↓-
(skip 6 - timing separator)
(right-to-left order creates swap effect)
```
### Verification Results
**Before Fix:**
```
Horizontal: 101111001111010
Vertical: 101111001111100
Match: ❌
```
**After Fix:**
```
Horizontal: 101111001111100
Vertical: 101111001111100
Match: ✅ PERFECT!
```
## Why This Matters
Format information tells the scanner:
1. Which error correction level to use
2. Which mask pattern was applied to data
**Without correct format info:**
- Scanner can't decode the mask pattern
- Data appears corrupted
- QR code is completely unreadable
**With correct format info:**
- Scanner knows how to unmask data
- Error correction works properly
- QR code scans successfully
## Files Changed
### `/home/michael/dev/michaelschiemer/src/Framework/QrCode/Structure/FormatInformation.php`
**Method:** `applyFormatBitsHorizontal()` (lines 105-120)
**Change:**
- Removed `$bitIndices` array
- Changed from `$bitIndices[$i]` to sequential `$i`
- Updated comment to explain column order creates swap
## Testing
### Test Files Created
1. `tests/debug/generate-reference-qr.py` - Python reference QR code
2. `tests/debug/compare-matrices.php` - Bit-by-bit comparison
3. `tests/debug/decode-python-format.php` - Reverse engineer Python's placement
4. `tests/debug/find-horizontal-pattern.php` - Discovered bit mapping
5. `tests/debug/debug-last-bits.php` - Debug specific bit positions
6. `tests/debug/analyze-horizontal-issue.php` - Identified double-swap problem
7. `tests/debug/final-verification.php` - Complete verification
### Generated QR Codes
1. `public/qrcode-python-large.png` - Python reference (✅ WORKS)
2. `public/qrcode-CORRECTED.png` - After initial fix attempt
3. `public/qrcode-FINAL.png` - After complete fix (✅ SHOULD WORK)
## Next Steps
**User Testing Required:**
Test `qrcode-FINAL.png` with smartphone scanner:
- URL: https://localhost/qrcode-FINAL.png
- Expected result: Decodes to "HELLO WORLD"
If successful, QR code implementation is COMPLETE! ✅
## Lessons Learned
1. **Don't assume bit placement patterns** - verify against working reference
2. **Column/Row order matters** - can create implicit swapping
3. **Test with real scanners** - technical correctness ≠ scanner compatibility
4. **Python qrcode library is excellent reference** - ISO-compliant and battle-tested
5. **Format information is critical** - without it, nothing else matters