API - изменить логику установки (install)

[konard]

Summary

This PR implements the async installation logic as requested in #52.

Changes Made

1. Background Thread Execution for /api/install

   • Installation now runs in a separate background thread
   • Returns immediately with a task_id for tracking
   • Same parameters generate the same task_id (using MD5 hash)

2. New /api/status/<task_id> Endpoint

   • Returns installation status: processing, completed, or error
   • Returns current report content (result)
   • Auto-deletes task file when completed/error status is retrieved
   • Returns 404 on subsequent requests after cleanup

3. Task File Management

   • Task files stored in api/tasks/ directory
   • File name is {task_id}.txt
   • Gradually populated with installation output
   • Cleaned up automatically when final status is retrieved

API Changes

POST /api/install - Changed response:

{
  "success": true,
  "task_id": "abc123...",
  "message": "Installation started"
}

GET /api/status/<task_id> - New endpoint:

{
  "success": true,
  "status": "processing|completed|error",
  "result": "Installation output..."
}

Implementation Details

• Uses Python threading.Thread for background execution
• MD5 hash of script_name:server_ip:server_root_password:additional for task_id
• Task files contain STATUS: prefix line followed by output content
• Streaming output written line by line during SSH execution
• API version updated to 1.2.0

Test Plan

• Run all unit tests (pytest examples/test_flask_api.py -v)
• Verify task_id generation is consistent for same parameters
• Verify status endpoint returns correct status values
• Verify task file cleanup after completed/error status retrieval
• Verify subsequent requests return 404 after cleanup

Fixes

Fixes #52

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[konard]

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