feat: name live feed routes and sources for what they serve

The flight, military and vessel feeds were named after the providers the
bundled server uses (/api/opensky, /api/adsblol/mil, /api/ais-live and
their track routes; createOpenSkySource, createAdsbLolSource,
createAisStreamSource). Any server should be able to answer a feed from
its own provider, so the feeds are now:

  /api/flights   /api/flights/track?icao24=
  /api/military  /api/military/track?hex=
  /api/vessels   /api/vessels/track?mmsi=

with createFlightSource, createMilitarySource and createVesselSource. The
old routes are removed. Each server names its provider in X-Feed-Source
(the bundled server sends OpenSky Network, adsb.lol and AISStream, so its
attribution is unchanged) and the military feed's cache state and age in
X-Feed-Cache and X-Feed-Age-Ms. Sources report the provider the server
names and fall back to the feed's name.

src/layers/vessels/queries.js

@@ -36,7 +36,7 @@ export function createQueries({
   /**
    * Chip text for a feed the server has reported as not delivering.
    * @param {string} status - 'stale' | 'reconnecting' | 'down'
-   * @param {Object} payload - Parsed /api/ais-live JSON.
+   * @param {Object} payload - Parsed /api/vessels JSON.
    * @returns {string}
    */
 
@@ -61,12 +61,12 @@ export function createQueries({
   }
 
   /**
-   * Derive a surfaced error string from an /api/ais-live payload, or null when the
+   * Derive a surfaced error string from an /api/vessels payload, or null when the
    * feed has accepted product data. Socket transport, message receipt, and usable
    * vessel positions are separate health stages: an open socket with no message
    * or no accepted positions must not read as a fresh successful update.
    *
-   * @param {Object|null|undefined} payload - Parsed /api/ais-live JSON.
+   * @param {Object|null|undefined} payload - Parsed /api/vessels JSON.
    * @param {number} acceptedRowCount - Number of rows accepted by vessel normalization.
    * @returns {string|null} A short reason for the chip, or null if healthy.
    */
@@ -106,7 +106,7 @@ export function createQueries({
 
   /**
    * Classify one server snapshot before any destructive reconciliation.
-   * @param {Object|null|undefined} payload - Parsed /api/ais-live payload.
+   * @param {Object|null|undefined} payload - Parsed /api/vessels payload.
    * @returns {{transportStatus: string|null, lastMessageAt: number|string|null,
    *   rawRows: Array<Object>, acceptedRows: Array<Object>, rawRowCount: number,
    *   acceptedRowCount: number, error: string|null}}
@@ -140,7 +140,7 @@ export function createQueries({
    * Map one internal vessel record to a plain JSON-safe analyst record
    * (analyst query engine seam). Pure — no Cesium types. Missing/unknown
    * fields are null, never NaN/undefined. navStatus is always null: the
-   * /api/ais-live proxy does not surface AIS NavigationalStatus, so it
+   * /api/vessels proxy does not surface AIS NavigationalStatus, so it
    * cannot be derived client-side.
    * @param {Object|null|undefined} record - `state.records.byMmsi`/`state.records.all` entry.
    * @returns {{id: string|null, mmsi: string|null, name: string|null,