farmd MVP scaffold: HTTP server, healthz, dashboard placeholder

Go printer-farm manager (Wave 1, Redmine #855). Cloudron-deployable,
OIDC via platform provider planned; Moonraker/OctoPrint/Bambu adapters
+ Dolibarr connector are the next milestones. Dockerfile: multi-stage,
non-root, no Node anywhere in the chain.

README.md

@@ -0,0 +1,27 @@
+# STLP Shop Manager
+
+Go printer-farm manager for Starting Line Productions — Etsy batch printing
+with Dolibarr ERP/MRP integration. Cloudron-deployable, OIDC via the platform
+provider.
+
+Design + proposal: Redmine [#855](https://projects.knownelement.com/issues/855)
+(program: [#836](https://projects.knownelement.com/issues/836), RDStack).
+
+## Status
+
+MVP scaffold: HTTP server + /healthz + dashboard placeholder. Next: printer
+adapters (Moonraker/Klipper, OctoPrint, Bambu), job queue + state machine,
+Dolibarr connector, OIDC login (Cloudron platform provider).
+
+## Build & run
+
+    go build ./cmd/farmd
+    FARMD_ADDR=:3000 FARMD_DB_PATH=/tmp/farmd.db ./farmd
+
+Docker: `docker build -t farmd .` (serves :3000, data at /app/data).
+
+## Layout
+
+    cmd/farmd/         entrypoint
+    internal/server/   HTTP surface (healthz, dashboard)
+    web/templates/     embedded dashboard templates