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/widgets.yaml

@@ -0,0 +1,19 @@
+# Top-of-page widgets. https://gethomepage.dev/widgets/info/
+
+- search:
+    provider: custom
+    url: https://searxng.n0n.io/search?q=
+    target: _blank
+    focus: true
+
+- resources:
+    label: framework
+    cpu: true
+    memory: true
+    disk: /
+
+- datetime:
+    text_size: xl
+    format:
+      timeStyle: short
+      dateStyle: medium