Add a custom Jinja filter `image_url` to `app.py` to correctly resolve image paths from object storage or local static files, and update all relevant templates (members, sponsors, competitions, contributors) to use this new filter instead of the `url_for('static', filename=...)` function, ensuring images are displayed correctly regardless of their storage location.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cd9a7d26-a4e5-4215-975c-c59f4ed1f06d
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Adds a new POST route `/admin/competition/edit` to update competition data in the database, including handling image uploads and preserving existing images. Updates `replit.md` and `templates/admin/competitions.html` to include UI elements and logic for editing competitions.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cd9a7d26-a4e5-4215-975c-c59f4ed1f06d
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