Add period selector for 1-year price visualization

Fix JS duplication error

Enhance Price Trend Analysis with Dual View

Implement Price Trend Analysis and Fix Static Files

Fix Modul 9 logic and bump cache version to v4

Add debug alert and update JS version to v3

Fix JS syntax errors and restore missing logic

Fix JS syntax and improve initialization reliability

Force JS reload with cache buster and remove debug alert

Fix dashboard modules: update API endpoints and clean up HTML/JS

Add debug alerts to JS

Modularize integrated recommendation dashboard and add tests