[both] Troubleshooting guide based on top forum errors

[strausmann]

Forum Evidence

Recurring errors across 30 forum threads:

Error	Frequency	Forum Threads
403 Forbidden after CrowdSec Bouncer	Very High	80+ replies in main thread
YAML indentation errors ("Additional property not allowed")	High	Multiple threads
Container race conditions (CrowdSec not ready)	Medium	Setup guides
Slow/bursty Newt tunnel speed	Medium	1,680 views, 15 replies
Let's Encrypt cert failures	Medium	Multiple threads
Middleware not applying to resource	Medium	Middleware Manager threads

What's Missing

No centralized troubleshooting page exists for either product. Users search the forum, find partial answers in 80-reply threads, and often give up.

Proposed Content

Structured troubleshooting guide:

1. Error → Cause → Fix format (scannable)
2. Grouped by product (CrowdSec Manager / Middleware Manager / Integration)
3. Every fix includes the exact command or config change
4. Links to relevant forum threads for context
5. "Still stuck?" → Link to forum + Discord

Acceptance Criteria

• Top 10 forum errors documented with fix
• Error messages are searchable (users will Google them)
• Each fix tested on test instance
• Forum threads referenced as sources

[github-actions]

This issue has been inactive for 14 days. If it's blocked by #14 (Maintainer Alignment), please add status:blocked label. If work can proceed, please update the status.