feat: initialize ERP base platform (extracted from HMS)

- Stripped 11 business crates (health, ai, dialysis, plugins)
- Cleaned AppState, AppConfig, main.rs from business coupling
- Reduced migrations from 169 to 53 (base-only)
- Removed health_provider trait from erp-core
- Removed business integration tests
- Removed gateway rate limiting middleware
- Base capabilities: auth, RBAC, JWT, config, workflow, message, plugin, audit, crypto, RLS, multi-tenant

Cargo check: OK
Cargo test: OK

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "erp",
+  "private": true,
+  "scripts": {
+    "start:dev": "powershell -ExecutionPolicy Bypass -File ./dev.ps1",
+    "start:stop": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Stop",
+    "start:restart": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Restart",
+    "start:status": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Status",
+    "prepare": "simple-git-hooks"
+  },
+  "simple-git-hooks": {
+    "pre-commit": "npx lint-staged"
+  },
+  "devDependencies": {
+    "js-yaml": "^4.1.1",
+    "lint-staged": "^15.0.0",
+    "simple-git-hooks": "^2.12.0"
+  }
+}