feat: extract shared infrastructure from shared_lib

Phase 1-3 of decoupling plan:
- Shared DB, models, infrastructure, browser, config, utils
- Event infrastructure (domain_events outbox, bus, processor)
- Structured logging
- Generic container concept (container_type/container_id)
- Alembic migrations for all schema changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

browser/templates/macros/glyphs.html

@@ -0,0 +1,17 @@
+{% macro opener(group=False) %}
+    <svg
+        class="h-4 w-4 transition-transform group-open{{ '/' + group if group else ''}}:rotate-180"
+        xmlns="http://www.w3.org/2000/svg"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+      >
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M6 9l6 6 6-6"
+        />
+      </svg>
+
+{% endmacro %}