Harden security: enable Jinja2 autoescape, add SQL table whitelist, enforce HTTPS#29
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Hardens security across the codebase by closing three vectors identified during the codebase audit.
This PR enables Jinja2 autoescape on the HTML report template to prevent XSS from user-provided or dataset-sourced fields, adds a table name whitelist in load_data() to prevent SQL injection via interpolated table names, and enforces HTTPS in all API URL builders so that http:// hosts are upgraded rather than passed through with bearer tokens in cleartext.