[Jobs Match Making] Move matching logic into Redis Lua scripts

[aldbr]

Description

Move the matching and prioritization logic into Lua scripts executed server-side in Redis. The full match operation should be a single atomic call.

Implement incrementally, starting with the simplest comparison and building up.

Definition of Done

• Lua script(s) implementing the match operation
• Python client calls the script with pilot node characteristics and receives a job ID
• Correctness: identical results to Python prototype on test cases
• Locust benchmark: compare vs Python+Redis (Issue 6)

Stretch:

• Full prioritization logic in Lua (running limits, round-robin)
• All comparison types including tag expressions in Lua