luci-mod-network: move AHCP protocol model to AHCP application

Signed-off-by: Jo-Philipp Wich <redacted>

diff --git a/modules/luci-mod-network/luasrc/model/cbi/admin_network/proto_ahcp.lua b/applications/luci-app-ahcp/luasrc/model/cbi/admin_network/proto_ahcp.lua
similarity index 100%
rename from modules/luci-mod-network/luasrc/model/cbi/admin_network/proto_ahcp.lua
rename to applications/luci-app-ahcp/luasrc/model/cbi/admin_network/proto_ahcp.lua