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/settings.yaml

@@ -0,0 +1,26 @@
+# Top-level dashboard settings. https://gethomepage.dev/configs/settings/
+
+title: localgenai
+favicon: https://gethomepage.dev/favicon.ico
+theme: dark
+color: slate
+
+headerStyle: clean
+language: en
+target: _blank
+
+# Layout: keep the four service groups in a 3-column grid each so a tile
+# fits comfortably without wrapping on a 1440-wide laptop.
+layout:
+  Inference:
+    style: row
+    columns: 3
+  Agent UIs:
+    style: row
+    columns: 3
+  Observability:
+    style: row
+    columns: 3
+  External:
+    style: row
+    columns: 3