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)

.gitattributes

@@ -0,0 +1,28 @@
+# Line endings — normalize to LF
+*                 text=auto eol=lf
+*.bat             text eol=crlf
+*.cmd             text eol=crlf
+*.ps1             text eol=crlf
+
+# Lockfiles are binaries (don't diff them)
+*.lock            -text
+package-lock.json -text
+pnpm-lock.yaml    -text
+yarn.lock         -text
+bun.lock          -text
+bun.lockb         binary
+uv.lock           -text
+poetry.lock       -text
+
+# Generated / vendored
+openapi.json      linguist-generated=true
+dist/**           linguist-generated=true
+build/**          linguist-generated=true
+*.tsbuildinfo     linguist-generated=true
+node_modules/**   linguist-generated=true
+.ruff_cache/**    linguist-generated=true
+.mypy_cache/**    linguist-generated=true
+.pytest_cache/**  linguist-generated=true
+
+# Linguist overrides
+*.py              linguist-language=Python