[SECURITY] Directory Traversal in GeoIP Download

[arumes31]

Fixed a directory traversal vulnerability in internal/tasks/geoip_task.go. The issue was that the edition parameter was not strictly validated, potentially allowing an attacker to influence URL construction or file paths.

I implemented a strict regex-based allow-list (^[a-zA-Z0-9-]+$) for the edition string and enforced it at all entry points:

1. In NewGeoIPUpdateTask (constructor), preventing the creation of malicious tasks.
2. In ProcessTask (handler), as a second layer of defense.
3. In Download, to ensure the dynamic URL construction is safe.
4. In getDBPath, as a defense-in-depth measure for file system operations.

Unit tests were updated to verify that traversal attempts are caught early and rejected.
The learning was recorded in .jules/sentinel.md.

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PR created automatically by Jules for task 4554217155269103256 started by @arumes31

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