[Sebas1705]

Rewrites the four central routing docs to match main after bff-backoffice #9 and Backoffice #7 removed the routing plane (service targets, presets, connections, Kubernetes overview, routing history).

• runtime-routing-and-service-targeting.md and runtime-routing-control.md: now describe only the llama target flow (Backoffice card -> BFF /v1/backoffice/ai-engine/* -> ai-engine-api /internal/admin/llama-target), persistence, allowlist, with a short History note.
• service-communication.md: runtime control routes table reduced to the real routes.
• public-edge-routing.md: notes the gateway's separate /internal/admin/ai-engine/target store and the dead forwarding entries still in routeTable.ts. No gateway cleanup PR is open, so this is documented as current state.

Link check (same logic as the Validate Docs workflow, run with Node): ok across 83 files.

Not covered: other docs still mention presets/service targets (see PR comment).

[Sebas1705]

Out of scope here, still mentioning presets or service-target overrides: architecture/target-architecture.md, c4-views.md, repository-map.md, decision-records/0005-runtime-control-plane.md, guides/capabilities/ai/ai-content-generation.md, guides/foundations/platform-capability-matrix.md, platform-functional-overview.md, operations/functionality-review-baseline.md, operations/threat-model.md; plus bff-backoffice/docs and README, platform-infra/kubernetes/README.md.