feat(odin): Phase 2a read-only agentic assistant + tool-trace UI

- agentic chat loop (max 6 round-trips, budget re-checked between iterations)
  over 10 read-only, permission-delegated tools in src/services/ai-tools.ts
- persist assistant tool trace in ai_chat_messages.content_json (+ migration)
- consulted-tools chips in OdinThread; header now shows month spend only
  (budget cap hidden from the UI, server-side 402 guard unchanged)
- seed: ai.use permission; Settings exposes the ai permission module
- docs: REVIEW consolidation; deployment-guide.md superseded by docs/release.md

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/schemas/ai.schema.ts

@@ -19,6 +19,20 @@ export const AiHistoryAppendSchema = z.object({
       z.object({
         role: z.enum(["user", "assistant"]),
         content: z.string().min(1).max(8000),
+        // Structured per-message metadata (assistant tool trace) → content_json.
+        meta: z
+          .object({
+            tools: z
+              .array(
+                z.object({
+                  name: z.string().max(100),
+                  label: z.string().max(100),
+                  ok: z.boolean(),
+                }),
+              )
+              .max(30),
+          })
+          .optional(),
       }),
     )
     .min(1, "Žádné zprávy")