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)

.github/workflows/ci.yml

@@ -107,9 +107,8 @@ jobs:
   qdrant-cleanup:
     # T15 (G14 FIX) — informational check. Qdrant only runs on netcup,
     # not in CI, so this will always skip here. The audit script
-    # gracefully handles connection failures.
+    # gracefully handles connection failures (inner step uses || \).
     runs-on: ubuntu-latest
-    continue-on-error: true
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5