sightsound: move FLM NPU endpoint port 52626 -> 7771

Env file is the source of truth (unit ExecStart runs the serve script which
sources it); serve-script default and the deployer health-gate URL flipped in
lockstep so the post-restart health gate polls the new port. Docs, fleet table,
and both index bullets updated to match.

scripts/serve-frank-default-sightsound.sh

@@ -30,7 +30,7 @@ fi
 : "${FLM_BIN:=/usr/bin/flm}"
 : "${FLM_MODEL:=gemma4-it:e4b}"
 : "${FLM_HOST:=0.0.0.0}"
-: "${FLM_PORT:=52626}"
+: "${FLM_PORT:=7771}"
 : "${FLM_PMODE:=turbo}"
 : "${FLM_ASR:=0}"
 : "${FLM_CTX_LEN:=131072}"