Initial commit

- REST API for calculating age breakdowns (years, months, weeks, days, hours, minutes, seconds)
- Birthtime configured as Unix timestamps
- Sleeps until next birthday countdown
- Per-person lookup via GET /age/{name}
- Docker and Makefile build support
- Woodpecker CI pipelines

.woodpecker/test.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: test
+    image: golang:1.25
+    commands:
+      - go test -race -count=1 ./...