feat(chat): MCP tool apps — custom inline renderers for 12 tools

12 of 33 MCP tools now render as rich inline cards instead of raw JSON:
EntityCard, HealthSummary, LXCList, EntityTable, KnowledgeResults,
BlastRadius, ChangeLog, FleetSnapshot, MetricChart.

Architecture:
- Server: annotateJSONResult() wraps queryRows with __renderer hints
- Registry: match/dispatch system maps tool names to Svelte components
- Chat: inline dispatch with 5-card limit, overflow to collapsed group
- ToolCallGroup: unmatched prop, hides when all matched, ARIA labels

Tests: 3 new Go tests for annotateJSONResult (wrap, no-op, multi-row).

web/src/lib/renderers/entity-table.ts

@@ -0,0 +1,9 @@
+import { registerToolRenderer } from '$lib/tool-renderers'
+import EntityTable from './EntityTable.svelte'
+
+export function init() {
+  registerToolRenderer({
+    match: (t) => t.name === 'list_entities' || t.result?.__renderer === 'entity_table',
+    component: EntityTable,
+  })
+}