Unused configuration fields in LocationConfig

[wilke]

Summary

Several fields in LocationConfig are parsed from YAML but never used in the codebase, creating confusion about what configuration options actually work.

Location

shock-server/conf/conf.go

Unused Fields

Field	Line	Notes
Prefix	32	Parsed but never referenced
Token	30	Redundant with AuthKey/SecretKey
GCloudLocation.Project	62	Only Bucket/SecretKey used
RecoveryCommand	-	TSM handled by external scripts

Impact

• Users may configure these fields expecting behavior changes
• Documentation may reference features that don't work
• Code maintenance burden for unused fields

Recommendation

1. Either implement the intended functionality for these fields
2. Or remove them from the struct and document why they're not needed

Priority

Low - cleanup/documentation issue