Add finalpool branch with implemented tasks

[petermac10]

This PR adds the finalpool branch containing all implemented tasks (tasks whose docs are non-empty and all English per the requirements in tasks/examples). The implementing tasks (containing Chinese text in docs) are excluded.

Implemented tasks added under tasks/finalpool/:

• fan-dev: loyalty-program, discount-calculator, price-tracker
• gyy: tag-manager, sitemap-generator, robots-handler
• haoze: media-organizer, streaming-service
• jl_dev: customer-feedback-processor, inventory-management
• junteng_dev: customer-portal, help-desk, shipment-tracker
• junxian_dev: social-connector
• lueyang-dev: territory-manager, client-portal
• ruige: web-crawler, log-analyzer, expense-tracker
• wenshuo-dev: cache-optimizer, scheduler
• xiaochen_dev: status-checker, health-monitor, error-tracker
• yuxuan-dev: sync-service, task-scheduler
• zhaochen: certificate-manager, storage-manager

Excluded (implementing): currency-converter (junxian_dev), audit-logger (yuzhen-dev), resource-monitor (yuzhen-dev).