feat: add ship tools

Add vessels_in_area, find_vessel and get_vessel_track over the live
vessel source, and a ships section in situation_brief. Without an AIS
key the source's own message reaches clients as an unavailable feed.

scripts/package-boundaries.json

@@ -3096,6 +3096,7 @@
       "src/tools/queries/mobility.js",
       "src/tools/queries/environment.js",
       "src/tools/queries/brief.js",
+      "src/tools/queries/maritime.js",
       "src/sources/gbfsStations.js",
       "src/sources/tle.js",
       "src/data/satellitePass.js"