feat(llm): rename inference services dropping 'default' from names

frank-default-large -> frank-large (Dankclaw :7770), frank-default-small ->
frank-small (Dankserver :7770), frank-default-sightsound -> frank-npu
(Dankclaw :7771). Units, env files, serve scripts, deploy-plan mappings,
deploy-remote dispatch (stop/disable old units + relink + enable new), and the
test seams move together. Retired frank-default-npu.* artifacts moved to
scripts/.AGENTTRASH/ (tracked-in-history; ignored on disk).

Served aliases become frank-large / frank-small via --alias; the NPU endpoint
serves the whole FLM registry, so its rename changes no served tags.

tests/deployment_flow.bats

@@ -73,7 +73,7 @@ load helpers
 }
 
 @test "inference restarts are absent from the top-level dispatcher" {
-    ! grep -qE 'systemctl .*restart (frank-default-small|frank-default-large)' "$REPO_ROOT/scripts/deploy.sh"
+    ! grep -qE 'systemctl .*restart (frank-small|frank-large|frank-npu)' "$REPO_ROOT/scripts/deploy.sh"
 }
 
 @test "remote runner health-checks an inference endpoint" {