Phase 1: Compass/NHS skeleton (Go, SQLite, session login, Docker, Caddy)

Phase 1 of AGENTS.md §11: the app runs on .13 in its own container on port
8792, behind Caddy at school.lab.audasmedia.com.au, with its own session login
and GET /health.

- Go service (Go 1.25, modernc SQLite, no cgo) with its own image.
- SQLite schema per AGENTS.md §7: children, items, scans, notifications,
  session (internal/store/migrations/001_init.sql).
- Separate session login (signed cookie, CSRF double-submit), not SSO.
- HTMX server-rendered shell using the Family Home Lab tokens.css: canvas
  #f6f5f4, action blue #0075de, Inter, 8px grid, hairline borders, pill CTAs,
  dark mode, phone-friendly.
- Fail loudly (FR-12): a missing or failed scan shows as an explicit warning or
  error banner, never as an empty day.
- Dockerfile + docker-compose.yml (own container, own port 8792; uses
  network_mode bridge because .13 has no free default Docker address pool).
- Caddy snippet for .35 in deploy/caddy/, deployment notes, and
  deploy/verify-phase1.sh.

No school scan in this phase; the Compass login and fetch are Phase 2.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

go.mod

@@ -0,0 +1,20 @@
+module gitea.lab.audasmedia.com.au/sam/compass_teams_nhs
+
+go 1.25
+
+require (
+	golang.org/x/crypto v0.42.0
+	modernc.org/sqlite v1.34.5
+)
+
+require (
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/sys v0.36.0 // indirect
+	modernc.org/libc v1.55.3 // indirect
+	modernc.org/mathutil v1.6.0 // indirect
+	modernc.org/memory v1.8.0 // indirect
+)