fix(db): rename mesh.member export to meshMember to avoid collision with auth.member

The schema/index.ts barrel does `export * from "./mesh"` + `export *
from "./auth"`. Both modules exported a symbol named `member`, which
caused TypeScript to silently exclude the ambiguous re-export and
drizzle-kit's introspection couldn't see mesh.member — its generated
migration was missing that table entirely.

Fix: rename the TypeScript binding only. The DB table name stays
"member" inside pgSchema "mesh" (still mesh.member in SQL):
- `export const member = schema.table("member", ...)` →
  `export const meshMember = schema.table("member", ...)`
- Internal references in mesh.ts updated (FK lambdas, relations,
  Zod schemas, inferred TS types)
- apps/broker/src/broker.ts import updated to meshMember as memberTable
- migrations/0000_sloppy_stryfe.sql regenerated — now includes all 7
  mesh.* tables (audit_log, invite, member, mesh, message_queue,
  pending_status, presence)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/db/migrations/meta/_journal.json

@@ -0,0 +1,13 @@
+{
+  "version": "7",
+  "dialect": "postgresql",
+  "entries": [
+    {
+      "idx": 0,
+      "version": "7",
+      "when": 1775335397081,
+      "tag": "0000_sloppy_stryfe",
+      "breakpoints": true
+    }
+  ]
+}