feat(path): add total path distance display

[codemonkeybr]

Summary

• Sums the haversine distance from sender → through each intermediate repeater → to the bot and appends it to the path command response
• Silently omitted when any node in the chain has no known coordinates in the database (to avoid showing an inaccurate partial distance)
• Controlled by show_path_distance config flag (default: true)
• Adds distance_traveled translation key for all 10 supported locales (de, en-GB, es, fr, fr-CA, nl, pl, pt-BR, pt, en)

Example output:

26: Auburn Off-Leash
14: Repeater-NE
📏 12.4 km traveled

Test plan

• Send a path command from a node with known coordinates through repeaters with known coordinates — distance line should appear
• Send a path command where one repeater has no coordinates in DB — distance line should be silently omitted
• Set show_path_distance = false in config — distance line should never appear
• Verify all locale translations render correctly by switching locale in config

[codemonkeybr]

Dear maintainer, dont merge just yet. im running some live tests on my local mesh with other folks helping me, i think there is a bug.

[codemonkeybr]

Someone has reported a bug, but aint a bug, was an expected behaviour, sender didnt have coords enable on adverto so bot didnt count the sender -> repeater distance.

Good to merge