feat: Introduce BrowserlessService for persistent web scraping with enhanced Amazon price extraction, alongside initial scheduler service and task tracking.

task.md

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+# Task: Fix Screenshot Update in Tracking
+
+## Context
+The user reports that forcing an update in the "Suivi" (Tracking) section does not update the screenshot as expected.
+
+## Current Focus
+Investigating the "force update" mechanism and why the screenshot is not refreshing.
+
+## Master Plan
+- [x] Investigate the "force update" API endpoint and backend logic.
+- [x] Check how screenshots are captured and saved in `tracking_scraper_service.py` or similar.
+- [x] Verify if the frontend is correctly requesting the update and displaying the new image.
+- [x] Fix the issue preventing the screenshot from updating.
+- [x] Verify the fix (Code review confirms relative paths are now consistent across the app).
+
+## Progress Log
+- Created `task.md`.