Add module size override flags

[pfeerick]

Summary

• Adds global module_size_std / module_size_sml flags mapping to -DMODULE_SIZE_STD=<value> / -DMODULE_SIZE_SML=<value> (closes add module size override flags #78)

MODULE_SIZE_STD/MODULE_SIZE_SML control which external-module type sets show up in the module menu (radio/src/gui/gui_common.cpp) — they're independent gates, not mutually exclusive, so exposing both as plain YES/NO toggles (matching the pxx1/ghost/etc. pattern from #149) is safe. Most colorlcd-family targets already default MODULE_SIZE_STD=ON via a real CMake option(); this lets a build request explicitly turn that off and/or turn MODULE_SIZE_SML on instead. As with the other flags, this is a pure targets.json data change — no Go/frontend code needed.

Test plan

• jq . targets.json validates
• go build ./...
• go test ./targets/... ./firmware/... pass
• Ran the real API server locally (Postgres in Docker + go run ./cmd/ebuild run api):
  • GET /api/targets returns module_size_std/module_size_sml with ["YES","NO"]
  • POST /api/jobs on x10express with module_size_std=NO + module_size_sml=YES → 201, resolved to build_flags: [{"key":"MODULE_SIZE_SML","value":"YES"},{"key":"MODULE_SIZE_STD","value":"NO"}]

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