Handle root-vs-static index resolution for site entrypoint

[Copilot]

The site failed on hosts expecting index.html at repository root, while the project entrypoint lived under static/. This change makes entrypoint resolution tolerant to both layouts without changing existing static/ deployment behavior.

• Entrypoint resolution (Flask)

  • Updated / route to prefer /index.html at repo root when present.
  • Preserved fallback to static/index.html when root index is absent.

• Static-host compatibility

  • Added root index.html as a lightweight redirect to static/index.html so root-only host lookups still load the existing site.

• Behavioral impact

  • Local/runtime serving now supports both structures: root-index-first with static fallback.
  • Existing assets and static/ site structure remain unchanged.

@app.route('/')
def index():
    root_index = os.path.join(app.root_path, 'index.html')
    if os.path.exists(root_index):
        return send_from_directory(app.root_path, 'index.html')
    return send_from_directory(app.static_folder, 'index.html')

[Copilot]

🟢 Approval recommended

The requested entrypoint compatibility is implemented without changing the existing static site behavior.

Pull request overview

Adds compatibility for root-level and static/ site entrypoints while preserving existing deployment behavior.

Changes:

• Serves root index.html first, with a static fallback.
• Adds a root redirect to static/index.html.

File summaries

File	Description
index.html	Redirects root-host requests to the static site.
app.py	Implements root-first entrypoint resolution.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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