docs(readme): restructure readme with overview and styling :memo:

docs(usage): create usage documentation file :book:

feat(api): add HTTP API server and cron sync script :mushroom:

chore(deno): update deno.json compiler and lint config :eyes:

feat(api): implement new company and trading endpoints :fox_face:

feat(sample): add company logos and stocklist :indonesia:

docs(sample): add database schema reference in readme :memo:

chore(sample): add sample database via git lfs :file_folder:

refactor(core): enhance network fetcher and database sync :recycle:

refactor(idx-api): optimize and fix index synchronization logic :crocodile:

feat(idx-api): expand schemas and refactor cron system :baby_chick:

feat(Trading): implement market index functionality :octopus:

feat(Backend): implement company announcement storage and sync :newspaper:

feat(Participants): implement participants module and cron jobs :panda_face:

feat(Trading): update stock and trade summary implementation :cherry_blossom: