feat(infra): AMD/ROCm resource probe for the VRAM gauge

The resource gauge was NVIDIA-only — on an AMD/ROCm box Main fell back to
UnavailableProbe, so the TUI showed no VRAM. Add AmdResourceProbe backed
by `rocm-smi --showmeminfo vram --showuse --csv`: it skips the warning
preamble, locates the header by column name (order/version tolerant), and
converts the byte VRAM figures to MiB. Process RSS reuses /proc/<pid>/status
(only populated for a managed-model pid). Main now selects NVIDIA → AMD →
Unavailable. Tests cover the real ROCm 4.0 CSV + reordered columns.

apps/server/src/main/kotlin/com/correx/apps/server/Main.kt

@@ -55,6 +55,7 @@ import com.correx.infrastructure.InfrastructureModule
 import com.correx.infrastructure.inference.DefaultProviderRegistry
 import com.correx.infrastructure.inference.FirstAvailableRoutingStrategy
 import com.correx.infrastructure.inference.commons.ManagedInferenceRouter
+import com.correx.infrastructure.inference.commons.AmdResourceProbe
 import com.correx.infrastructure.inference.commons.NvidiaResourceProbe
 import com.correx.infrastructure.inference.commons.ResourceProbe
 import com.correx.infrastructure.inference.commons.UnavailableProbe
@@ -122,10 +123,12 @@ fun main() {
         val managedRouter = ManagedInferenceRouter(modelManager, descriptors, targetModelConfig.id)
         inferenceRouter = managedRouter
         modelSwapper = managedRouter
-        resourceProbe = if (NvidiaResourceProbe.isAvailable()) {
-            NvidiaResourceProbe(pidSupplier = { modelManager.currentPid() })
-        } else {
-            UnavailableProbe
+        resourceProbe = when {
+            NvidiaResourceProbe.isAvailable() ->
+                NvidiaResourceProbe(pidSupplier = { modelManager.currentPid() })
+            AmdResourceProbe.isAvailable() ->
+                AmdResourceProbe(pidSupplier = { modelManager.currentPid() })
+            else -> UnavailableProbe
         }
         // Shutdown hook to kill the managed llama-server
         Runtime.getRuntime().addShutdownHook(Thread {