Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

server/internal/api/testdata/ws_types_fixture.json

@@ -0,0 +1,32 @@
+{
+  "WSDashboardInit": [
+    "agents"
+  ],
+  "WSAgentOffline": [
+    "agent_id"
+  ],
+  "WSStatsUpdate": [
+    "agent_id",
+    "cpu_usage_pct",
+    "hashrate_15m",
+    "hashrate_15s",
+    "hashrate_1m",
+    "memory_usage_pct",
+    "shares_accepted",
+    "shares_submitted",
+    "uptime_seconds"
+  ],
+  "WSCommandResult": [
+    "action",
+    "agent_id",
+    "message",
+    "success"
+  ],
+  "WSAgentLog": [
+    "agent_id",
+    "content"
+  ],
+  "WSServerLog": [
+    "line"
+  ]
+}