Refactor: extract block executor service, deduplicate connection tests, clean up repo artifacts

[Copilot]

Codebase structure analysis identified a 2700-line endpoint file mixing routing with business logic, duplicated TCP connection test code across 5 block types, repeated API base URL constants across 7 frontend services, and ~10K lines of committed log/db/backup artifacts.

Backend: service extraction

• Extract execute_block(), models, and expression evaluators from workflows.py into backend/app/services/block_executor.py
• workflows.py: 2704 → 754 lines — now purely route definitions
• Deduplicate 5 nearly identical TCP connection test blocks (SSH/RDP/VNC/FTP/TCP) into _tcp_connection_test():

# Before: ~30 lines repeated per protocol
elif block_type == "connection.ssh_test":
    host = params.get("host", "")
    port = params.get("port", 22)
    import socket
    import time
    sock = socket.socket(...)
    # ... 25 more lines, copy-pasted for rdp/vnc/ftp/tcp

# After: single shared helper
elif block_type == "connection.ssh_test":
    return _tcp_connection_test(
        params.get("host", ""), params.get("port", 22), params.get("timeout", 5)
    )
elif block_type == "connection.rdp_test":
    return _tcp_connection_test(
        params.get("host", ""), params.get("port", 3389), params.get("timeout", 5), protocol="rdp"
    )

• Inline imports (socket, time, re, subprocess, xml.etree) moved to module-level

Frontend: shared API config

• New frontend/src/services/apiConfig.ts as single source of truth for API_BASE_URL
• 7 service files updated to import from shared config
• Removed dead BlockNode.tsx.bak (347 lines)

Repo hygiene

• .gitignore: added *.log, *.db, *.bak patterns
• Removed 14 tracked artifacts: application logs, test.db, timestamped script copies

Original prompt

please analyze codebase and suggest how we can structure our code better and make it smaller and more efficient overall without loosing functionality, respecting industry standard and community best practices

Custom agent used: AKIS
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