feat(pp): log redaction

[favonia]

Close #649.

• Define all "private" data types
• Implement the redaction of domain
  • Domains in config.Print
• Check the redaction of token
  • Errors from net Error strings show redacted URLs #603
• The data type dns-resource-id
  • Zone IDs and record IDs in api
• The data type linux-id
  • user IDs
  • group IDs
• Implement the un-redaction (for min mode)
  • Reveal URLs of custom provider
  • Reveal shoutrrr service URLs
  • Reveal Cloudflare tokens
  • Reveal Healthchecks URLs
  • Reveal Uptime Kuma URLs
• Warn about revealing tokens
• Warn about weird configurations (e.g., hiding IPs while Proxied=false)
• Document the new option

[codecov]

Codecov Report

Attention: Patch coverage is 46.96970% with 35 lines in your changes missing coverage. Please review.

Project coverage is 89.09%. Comparing base (3b42131) to head (8cfecb6).
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/config/env_base.go	10.52%	17 Missing ⚠️
internal/config/config_print.go	28.57%	4 Missing and 6 partials ⚠️
internal/pp/fmt.go	83.33%	5 Missing ⚠️
internal/config/config_read.go	0.00%	2 Missing ⚠️
cmd/ddns/ddns.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #785      +/-   ##
==========================================
- Coverage   90.48%   89.09%   -1.39%     
==========================================
  Files          52       52              
  Lines        2196     2228      +32     
==========================================
- Hits         1987     1985       -2     
- Misses        198      226      +28     
- Partials       11       17       +6     

Flag	Coverage Δ
unittests	89.09% <46.96%> (-1.39%)	⬇️

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