Hotfix: Configurable bill number serial digit count for Ruhunu

[buddhika75]

Summary

• Hotfix for Ruhunu Hospital — bill number serial digits are too long for QuickBooks upload
• Replace hardcoded 6-digit serial format (%06d) with configurable "Bill Number Serial Digit Count" option (default: 6)
• Add setInteger REST API endpoint to allow changing integer configs via API
• Clamp max digits to 12 for safety

Problem

Current: GRN/RHD/LBK/26/000001 (6-digit serial — too many characters for QB)
Required: GRN/RHD/LBK/26/00001 (5-digit serial)

Post-Deployment Steps

After deploying this hotfix, set the digit count to 5 via API:

curl -X POST "https://rh.carecode.org/rh/api/config/setInteger/Bill%20Number%20Serial%20Digit%20Count/5" \
  -H "Config: <API_KEY>"

Important Notes

• Only new bill numbers will be affected — past bill numbers will NOT be changed as they are already committed, printed records reference them, and searching them would be difficult
• Default remains 6 digits — no change until the API call is made
• Cherry-picked from development PR Add configurable bill number serial digit count #19636

Closes #19635

Test plan

• Verify default behavior (6 digits) unchanged when config not set
• Set config to 5 via API and verify new GRN bill numbers use 5-digit serial
• Verify existing bill numbers are unaffected

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