poi-index: extract pipeline (BRouter host) + import job (flagship) + e2e

- poi-extract.sh: PBF download -> osmium tags-filter -> centroid NDJSON +
  manifest, published via the Caddy sidecar at vSwitch-only /poi/*
- osmium-filters.txt + poi-selectors.sql generated from map-core selectors,
  guarded by sync tests so poiCategories stays the single source of truth
- poi-import.sh: checksum verify -> classify into category rows ->
  70% guard (--bootstrap override) -> atomic rename swap; node_exporter
  textfile metric for import outcome
- systemd service+timer units for both halves (monthly, offset)
- cd-infra.yml: ship infrastructure/scripts to the flagship
- e2e: mock /api/pois instead of /api/overpass

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

e2e/integration.test.ts

@@ -328,14 +328,15 @@ test.describe("Integration: BRouter routing", () => {
     expect(response.status()).toBe(401);
   });
 
-  test("rejects /api/overpass without an X-Trails-Session header", async ({ request }) => {
-    const response = await request.post(`${PLANNER}/api/overpass`, {
-      data: "data=[out:json];node[amenity=drinking_water](52.52,13.4,52.53,13.41);out;",
-      headers: {
-        "Content-Type": "application/x-www-form-urlencoded",
-        Origin: PLANNER,
+  test("rejects /api/pois without an X-Trails-Session header", async ({ request }) => {
+    const response = await request.get(
+      `${PLANNER}/api/pois?bbox=52.52,13.40,52.53,13.41&categories=drinking_water`,
+      {
+        headers: {
+          Origin: PLANNER,
+        },
       },
-    });
+    );
     expect(response.status()).toBe(401);
   });
 });