Add Homepage dashboard + dual-export OpenCode traces

Homepage as the front door: single page at framework:7575 with one tile
per service, live widgets where the upstream supports it (Ollama loaded
models, container state via docker.sock, etc.), bookmarks for reference
docs. Config files are pyinfra-managed — source of truth lives in
compose/homepage/, sync by editing there and re-running ./run.sh.

OpenCode plugin now dual-exports spans to Phoenix and OpenLIT in
parallel. Phoenix remains the per-trace waterfall view; OpenLIT picks
up the same data for fleet-level metrics. Each destination has its own
batch processor so a hiccup at one doesn't block the other.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyinfra/framework/compose/homepage/docker.yaml

@@ -0,0 +1,8 @@
+# Docker integration. https://gethomepage.dev/configs/docker/
+#
+# `localhost-docker` is the name services.yaml refers to via
+# `server: localhost-docker`. Homepage uses the mounted /var/run/docker.sock
+# (read-only) to render container state on each tile.
+
+localhost-docker:
+  socket: /var/run/docker.sock