Add IDR713 radar fetch and APNG loop

radarFetch.sh fetches BOM IDR713 transparencies (24h cache) and the
last six 6-minute echo frames, composites them via cached lower/upper
plates, and publishes an APNG loop to /srv/www/radar/.

systemd: radar.{service,timer} on a 6-min cadence, with retry units
mirroring the synoptic pattern.

nginx: new radar.pestrel.com vhost (still commented in setup.sh until
DNS propagation is confirmed).

setup.sh provisions radar dirs, installs radar units, enables timer.
deploy.sh accepts synoptic|radar arg.

Parameterised on product code; adding another radar is a one-line
config change.

Spec: doc/bom-radar-spec.md.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/nginx/radar.pestrel.com.conf b/nginx/radar.pestrel.com.conf
new file mode 100644
index 0000000..b7d9c08
--- /dev/null
+++ b/nginx/radar.pestrel.com.conf
@@ -0,0 +1,23 @@
+# BOM radar loop — radar.pestrel.com
+# Installed to /etc/nginx/conf.d/radar.conf by setup.sh
+#
+# Requires /etc/nginx/nginx.conf to include:
+#   include /etc/nginx/conf.d/*.conf;
+
+server {
+    listen 80;
+    listen [::]:80;
+    server_name radar.pestrel.com;
+
+    root /srv/www/radar;
+    index index.html;
+
+    # APNG refreshes every ~6 minutes; let clients revalidate often.
+    location ~ \.apng$ {
+        add_header Cache-Control "no-cache";
+    }
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+}