docs: add AfterCoin documentation and MetaMask guides

Comprehensive docs covering architecture, all components, Docker
services, environment variables, MetaMask connection (desktop + mobile),
administration commands, and troubleshooting.

Also adds Lua scripts to repo for version control, including the
periodic chain sync loop (every 30s) in the mainframe.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

servers/minecraft/lua-scripts/cardgen_startup.lua

@@ -0,0 +1,96 @@
+MAINFRAME_ID = 7
+
+-- AfterCoin Bridge config
+local BRIDGE_URL = "http://afc-bridge:3001"
+
+function addPlayer(player, name)
+	rednet.send(MAINFRAME_ID, {type="addPlayer", player=player, name=name}, "otto")
+	rednet.receive("otto")
+	return
+end
+
+-- Get wallet info from bridge API
+function getWalletInfo(diskId)
+	local ok, result = pcall(function()
+		local response = http.get(BRIDGE_URL .. "/api/wallet/" .. tostring(diskId))
+		if not response then return nil end
+		local data = textutils.unserialiseJSON(response.readAll())
+		response.close()
+		return data
+	end)
+	if ok and result and result.success then
+		return result
+	end
+	return nil
+end
+
+local drive = peripheral.wrap("top")
+rednet.open("left")
+
+while true do
+	term.clear()
+	term.setCursorPos(1,1)
+	term.setTextColor(colors.yellow)
+	print("=== Card Generator ===")
+	print("")
+	print("Insert a floppy disk")
+	print("in the drive above.")
+
+	os.pullEvent("disk")
+	os.sleep(0.5)
+
+	local player = drive.getDiskID()
+	if player then
+		term.setTextColor(colors.white)
+		print("")
+		term.write("Username: ")
+		local name = read()
+		term.setTextColor(colors.yellow)
+		print("Generating card for "..name.."...")
+
+		addPlayer(player, name)
+		drive.setDiskLabel(name.."'s L'Otto Card - $0")
+		local mountPath = drive.getMountPath()
+		if mountPath then
+			local filePath = fs.combine(mountPath, "bal")
+			local file = fs.open(filePath, "w")
+			if file then
+				file.write("0")
+				file.close()
+			end
+		end
+
+		-- Display wallet info for MetaMask
+		term.setTextColor(colors.lime)
+		print("Card created!")
+		print("")
+		local wallet = getWalletInfo(player)
+		if wallet then
+			term.setTextColor(colors.cyan)
+			print("== AfterCoin Wallet ==")
+			term.setTextColor(colors.white)
+			print("Address:")
+			print(wallet.address)
+			print("")
+			print("To view in MetaMask:")
+			print("Network: AfterLife")
+			print("RPC: play.consultoria-as.com:8545")
+			print("Chain ID: 8888")
+			print("")
+			print("Import wallet key at:")
+			print("/api/wallet/" .. tostring(player))
+			print("")
+			term.setTextColor(colors.yellow)
+			print("Press any key to eject...")
+			os.pullEvent("key")
+		end
+
+		drive.ejectDisk()
+		term.setTextColor(colors.lime)
+		print("Ejected.")
+	else
+		term.setTextColor(colors.red)
+		print("ERROR: Could not read disk.")
+		os.sleep(3)
+	end
+end