fix(evidence-ledger): stop writing unused config

[solomonneas]

Closes #528.

Summary

• Stop miseledger init from creating config.toml with unsupported db_path and cache_dir settings.
• Preserve existing user-created config files without modifying them.
• Add regression coverage for fresh initialization and existing config files.

Root cause

ResolvePaths derives runtime paths from the XDG environment. Nothing parses the config file written by init, so editing db_path appeared successful while imports continued writing to the default database.

Impact

Fresh initialization no longer advertises settings that MiseLedger ignores. Existing config files remain untouched and continue to have no effect on runtime path selection.

Verification

• PATH=/usr/local/go/bin:$PATH go test -race ./...
• ./scripts/verify (4220 passed, 3 skipped)

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