infra/dev: env_value defaults match compose, die helper, shared Gradle lock check; drop unused RCLONE_REMOTE and M2a leftovers; fix stale Pi compose path

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

infra/dev/up.sh

@@ -11,7 +11,7 @@ if [[ "${1:-}" == "--down" ]]; then
   exit 0
 fi
 
-port="$(dev_port)"
+port="$(env_value KVITT_DEV_PORT 8080)"
 lan="$(lan_address || true)"
 
 public_url="$(env_value KVITT_PUBLIC_URL)"
@@ -20,8 +20,8 @@ if [[ -z "$public_url" ]]; then
 fi
 export KVITT_PUBLIC_URL="$public_url"
 
-data_dir="$(dev_path "$(env_value KVITT_DEV_DATA_DIR)")"
-secrets_dir="$(dev_path "$(env_value KVITT_SECRETS_DIR)")"
+data_dir="$(dev_path "$(env_value KVITT_DEV_DATA_DIR ./data)")"
+secrets_dir="$(dev_path "$(env_value KVITT_SECRETS_DIR ../secrets)")"
 mkdir -p "$data_dir"
 if [[ ! -f "$secrets_dir/fcm-service-account.json" ]]; then
   echo "up.sh: no $secrets_dir/fcm-service-account.json; the server starts with push disabled." >&2
@@ -40,5 +40,4 @@ for _ in $(seq 1 30); do
   fi
   sleep 1
 done
-echo "up.sh: /health did not answer within 30 s; see infra/dev/logs.sh" >&2
-exit 1
+die "/health did not answer within 30 s; see infra/dev/logs.sh"