Configure Traefik for wildcard SSL certificates

- Add DNS resolvers (1.1.1.1, 8.8.8.8) to traefik.yml for faster DNS challenge
- Create wildcard-cert.yml to request *.kelinreij.duckdns.org certificate
- Add comprehensive setup documentation for wildcard certificates
- Update to use production Let's Encrypt email

This configuration will automatically request a wildcard certificate
covering all subdomains once the Let's Encrypt rate limit resets
(Feb 13, 2026 at 21:33 UTC), eliminating the need for individual
per-service certificates.

docker-compose/core/traefik/WILDCARD_CERT_SETUP.md

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+# Wildcard Certificate Setup Instructions
+
+## Current Status
+- Your HTTPS certificates ARE working (3 individual certificates restored)
+- Configuration is **ready** for wildcard certificate
+- **Rate limit hit**: Must wait until **2026-02-13 21:33 UTC** before requesting new certificates
+
+## Why You Hit the Rate Limit
+Let's Encrypt limits **5 certificates per exact set of domain names per week**. You requested individual certificates for each service multiple times during testing, hitting this limit.
+
+## Rate Limit Reset
+- **Reset Time**: February 13, 2026 at 21:33 UTC (approximately 4:33 PM EST)
+- **After reset**: Traefik will automatically request the wildcard certificate
+
+## What's Been Configured
+
+### 1. Wildcard Certificate Request
+File: `/opt/stacks/core/traefik/dynamic/wildcard-cert.yml`
+- Requests: `kelinreij.duckdns.org` + `*.kelinreij.duckdns.org`
+- Uses DNS challenge (already configured in traefik.yml)
+- Will cover ALL subdomains with one certificate
+
+### 2. Traefik Configuration Updated
+File: `/opt/stacks/core/traefik/config/traefik.yml`
+- Added DNS resolvers for faster DNS challenge
+- DNS challenge already configured for DuckDNS
+
+### 3. Current Certificates (Individual)
+- traefik.kelinreij.duckdns.org
+- pihole.kelinreij.duckdns.org
+- auth.kelinreij.duckdns.org
+
+## After Rate Limit Resets
+
+### Option A: Automatic (Recommended)
+1. Traefik will automatically request the wildcard certificate when it restarts or refreshes
+2. The wildcard-cert.yml configuration will trigger the request
+3. All services will automatically use the wildcard certificate
+
+### Option B: Manual Trigger
+If the automatic request doesn't happen:
+
+```bash
+# Clear existing certificates to force new request
+sudo cp /opt/stacks/core/traefik/letsencrypt/acme.json /opt/stacks/core/traefik/letsencrypt/acme.json.pre-wildcard
+sudo truncate -s 0 /opt/stacks/core/traefik/letsencrypt/acme.json
+sudo chmod 600 /opt/stacks/core/traefik/letsencrypt/acme.json
+
+# Restart Traefik to request wildcard certificate
+cd /opt/stacks/core
+docker-compose restart traefik
+
+# Wait 30 seconds and verify
+sleep 30
+sudo cat /opt/stacks/core/traefik/letsencrypt/acme.json | python3 -c "import sys, json; data=json.load(sys.stdin); certs = data.get('letsencrypt', {}).get('Certificates', []); [print(f'Main: {c[\"domain\"].get(\"main\")}, SANs: {c[\"domain\"].get(\"sans\", [])}') for c in certs]"
+```
+
+### Verify Wildcard Certificate
+You should see:
+```
+Main: kelinreij.duckdns.org, SANs: ['*.kelinreij.duckdns.org']
+```
+
+## Checking Rate Limit Status
+
+```bash
+# Check Traefik logs for rate limit errors
+docker exec traefik grep -i "rate" /var/log/traefik/traefik.log | tail -5
+
+# Check certificate requests
+docker exec traefik grep "obtaining.*certificate" /var/log/traefik/traefik.log | tail -5
+```
+
+## Future Service Additions
+
+Once the wildcard certificate is in place, new services will automatically use it. No need to request individual certificates anymore!
+
+## Avoiding Rate Limits in the Future
+
+1. **Use Staging for Testing**
+   Update `traefik.yml` temporarily when testing:
+   ```yaml
+   caServer: https://acme-staging-v02.api.letsencrypt.org/directory  # Staging
+   ```
+
+2. **Don't Clear acme.json Unless Necessary**
+   - Certificates auto-renew every 60 days
+   - Only clear if you need to switch certificate types
+
+3. **Wildcard = One Certificate for All Services**
+   - No more individual requests
+   - Add unlimited services without hitting limits
+
+## Backup Files Created
+- `/opt/stacks/core/traefik/config/traefik.yml.backup` - Original config
+- `/opt/stacks/core/traefik/letsencrypt/acme.json.backup` - Working certificates (restored)
+
+## Next Steps
+1. **Wait until February 13, 2026 at 21:33 UTC**
+2. Either let Traefik auto-request the wildcard cert, or trigger manually (Option B above)
+3. Verify the wildcard certificate is in place
+4. Enjoy unlimited service additions without rate limits!