feat: build CouchOS Melee appliance

templates/controllers/xbox-standard-controller.profile.ini

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+# Template only. Replace placeholder identifiers after discovery on this machine.
+# Preserve analog triggers. Do not convert triggers into digital-only bindings.
+# Suggested profile name: Couch Xbox Wireless
+# Suggested hotkey: map a safe combo that is unlikely to trigger accidentally.
+
+[Profile]
+Device = <REPLACE_WITH_DISCOVERED_DOLPHIN_DEVICE_NAME>
+ProfileName = Couch Xbox Wireless
+Notes = Preserve analog triggers; verify USB fallback; set safe exit hotkey manually in Dolphin UI.

templates/couchd.token.example

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+replace-with-long-random-token

templates/slippi/first-run-checklist.md

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+# Slippi First Run Checklist
+
+- Install or update Slippi Dolphin through the official Slippi Launcher.
+- Use your own unmodified NTSC 1.02 Melee image.
+- In the graphics UI set Vulkan, fullscreen, 4:3, 2x internal resolution, and V-Sync off.
+- Set replay storage to `/home/couch/Slippi`.
+- Confirm gameplay on HDMI-1 at `1920x1080@60` before attempting any refresh-rate changes.
+- If direct launch is unreliable, configure and validate the launcher shortcut fallback from `config/couchd.example.json`.