fix(healthcheck): sweep localhost -> 127.0.0.1 across all 48 templates

BusyBox wget (+ node/python/curl one-shots, incl mealie's socket tuple) resolve
localhost -> IPv6 ::1 with no cross-family fallback; an IPv4-only-binding app
reads docker-unhealthy while serving (vaultwarden, re-run 2026-07-06). Escalates
that instance to the class. Scoped strictly to healthcheck test: lines
(diff-reviewed: no env/config/label changed; .felhom.yml already clean). New
REUSE.md convention row.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6

templates/immich/docker-compose.yml

@@ -54,7 +54,7 @@ services:
         limits:
           memory: 2048M
     healthcheck:
-      test: ["CMD", "curl", "-sf", "http://localhost:2283/api/server/ping"]
+      test: ["CMD", "curl", "-sf", "http://127.0.0.1:2283/api/server/ping"]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -83,7 +83,7 @@ services:
         limits:
           memory: 1536M
     healthcheck:
-      test: ["CMD", "python3", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:3003/ping')"]
+      test: ["CMD", "python3", "-c", "import urllib.request; urllib.request.urlopen('http://127.0.0.1:3003/ping')"]
       interval: 30s
       timeout: 10s
       retries: 3