feat(backend): add tRPC with Hono adapter

- Add @trpc/server, @hono/trpc-server, zod dependencies
- Create tRPC context with BetterAuth session
- Create router with publicProcedure and protectedProcedure
- Mount tRPC at /trpc/* via Hono adapter

Co-authored-by: Ona <no-reply@ona.com>

apps/aris-backend/package.json

@@ -12,9 +12,12 @@
 		"@aris/core": "workspace:*",
 		"@aris/source-location": "workspace:*",
 		"@aris/source-weatherkit": "workspace:*",
+		"@hono/trpc-server": "^0.3",
+		"@trpc/server": "^11",
 		"better-auth": "^1",
 		"hono": "^4",
-		"pg": "^8"
+		"pg": "^8",
+		"zod": "^3"
 	},
 	"devDependencies": {
 		"@types/pg": "^8"