fix: wire admin router into main app + fix migration CLI command routing

[devin-ai-integration]

Summary

Fixes two escalations found during PR #10 testing:

1. Migration CLI (drizzle/migrate.ts): getPool() was called before command routing, so commands that don't need a database (generate, invalid commands) failed with "DATABASE_URL required" instead of showing their intended output.

 async function main() {
   const command = process.argv[2] || "status";
-  const pool = await getPool();
-  try {
-    switch (command) {
-      case "generate": ...
-      default: ...
-    }
+  if (command === "generate") { /* print instructions, return */ }
+  if (!["up", "down", "status"].includes(command)) { /* show usage, exit 1 */ }
+  const pool = await getPool(); // Only connect for commands that need DB
+  try { switch (command) { ... } }

2. Admin Router (server/admin/adminRouter.ts): Was a standalone module with its own initTRPC.create() — not reachable via HTTP. Now uses the shared tRPC instance (with admin role enforcement, OpenTelemetry tracing, superjson transformer) and is wired into appRouter as adminDashboard.*.

All 22 admin endpoints are now accessible at /api/trpc/adminDashboard.{transactions,kyc,compliance,system,users,reconciliation}.* with proper auth (requires role === 'admin').

Verification: 0 TypeScript errors, 1555/1559 tests passing (4 pre-existing failures unrelated to this change).

Link to Devin session: https://app.devin.ai/sessions/64d054ae77da41e9a2b74d8593fa635c
Requested by: @munisp

[devin-ai-integration]

Original prompt from Patrick

https://drive.google.com/file/d/14K-94cZoOVgiYCUA-VympU-4_8IBqv2d/view?usp=sharing
extract the contents of the archive. List all the features of the platform

[devin-ai-integration]

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