chore(rmi-backend): apply fleet-template standards — add .editorconfig + .gitattributes, fix stale IPs, tighten qdrant-audit CI gate

- Add .editorconfig (Python 4-space, default 2, LF, UTF-8) per fleet-template
- Add .gitattributes (LF normalization, lockfile binary, generated paths)
- Fix AGENTS.md:35 — netcup (100.100.18.18) → Talos (100.104.130.92)
- Mark TODO.md:5 done — Qdrant stale IP (fixed in 3c6b295)
- Remove continue-on-error: true from qdrant-cleanup job (inner step has || \, no behavior change)

Refs: standards/GAPS.md#4 (Make CI gates authoritative), standards/GAPS.md#9 (Repo tooling parity), standards/GAPS.md#12 (Documentation contradictions)

AGENTS.md

@@ -32,7 +32,7 @@ Read these files in order:
 
 ## The Server
 
-ALL work happens on netcup (100.100.18.18).
+ALL work happens on Talos (100.104.130.92).
 
 ```
 ssh netcup