[script][smith] Add private forge support with auto-renewal

[MahtraDR]

Summary

• Adds use_private_forge YAML setting for private forge rental workflows
• Walks to the town's private_forge room instead of finding a public anvil
• Reads the rental notice, parses ET timestamp (handles EST/EDT), and auto-renews if under 15 minutes remaining
• Ensures 50k copper on hand for rental costs
• Validates that the town has a private_forge entry in crafting data; if not, lists towns that do and exits with a helpful message
• Compatible with here flag (skips walk and rental check)

Example YAML

use_private_forge: true

Requirements

• Town crafting data must include a private_forge room ID in blacksmithing section
• Character needs sufficient funds for rental (50k copper)

Test plan

• use_private_forge: false (default): script behaves identically to before
• use_private_forge: true in a town with private forge: walks to forge, checks rental, auto-renews if needed
• use_private_forge: true in a town without private forge: exits with helpful error listing valid towns
• use_private_forge: true with here flag: skips walk and rental check
• Rental with > 15 min remaining: reports status, no renewal
• Rental with < 15 min remaining: auto-renews
• Insufficient funds for renewal: reports error

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