chore: bootstrap solid admin repo with migration plan

.gitignore

@@ -0,0 +1,6 @@
+node_modules
+dist
+.output
+.env
+.env.*
+.DS_Store

README.md

@@ -0,0 +1,8 @@
+# NXTGAUGE Admin Solid
+
+SolidStart migration target for `nxtgauge-nov-2025-frontend` (admin panel).
+
+## Principle
+Port admin modules one by one with strict API/permission parity.
+
+See `docs/MIGRATION_MASTER_PLAN.md`.

docs/MIGRATION_MASTER_PLAN.md

@@ -0,0 +1,18 @@
+# Admin Solid Migration Master Plan
+
+## Goal
+Migrate admin panel from Next.js to SolidStart while preserving operational workflows.
+
+## Priority Modules
+1. Runtime role management
+2. Onboarding schema management
+3. Role UI config management
+4. Approvals and verification
+5. Users and permissions
+
+## Stage Sequence
+1. Build admin shell with auth + permission guards.
+2. Port core management modules first.
+3. Port remaining admin modules.
+4. Validate parity with existing API behavior.
+5. Cut over after full acceptance.