Unhandled exception: AttributeError: 'Site' object has no attribute 'greenlet_manager'

### Step 1: Please describe your environment

* ZeroNet version: _____
* Operating system: _____
* Web browser: _____
* Tor status: not available/always/disabled
* Opened port: yes/no
* Special configuration: ____

### Step 2: Describe the problem:

#### Steps to reproduce:

1. _____
2. _____
3. _____

#### Observed Results:

* What happened? This could be a screenshot, a description, log output (you can send log/debug.log file to hello@zeronet.io if necessary), etc.

#### Expected Results:

* What did you expect to happen?

The issue contains only an AttributeError title and an empty reproduction template, with no environment or traceback details. First collect the missing environment, reproduction steps, observed results, and traceback, then locate where Site accesses greenlet_manager. Done means reproducing the exception and confirming the affected behavior works without it.

Written by the indexing model from the issue text.