refactor: migrate callers to poker_* APIs and add architecture docs

- Migrate all callers to use poker_vdxf.h functions:
  - bet.c, dealer.c, player.c, blinder.c, game.c
  - print.c, storage.c, test.c, dealer_registration.c
- Add poker_vdxf.h include to all relevant files
- Create docs/verus_migration/architecture.md with layered design
- Update docs/README.md with architecture links
- Update README.md with system architecture link

Migration summary:
- get_str_from_id_key() → poker_get_key_str()
- get_cJSON_from_id_key() → poker_get_key_json()
- append_cmm_from_id_key_data_*() → poker_append_key_*()
- update_cmm_from_id_key_data_*() → poker_update_key_*()
- list_dealers() → poker_list_dealers()
- list_tables() → poker_list_tables()
- find_table() → poker_find_table()
- join_table() → poker_join_table()
- is_table_full() → poker_is_table_full()
- decode_table_info_from_str() → poker_decode_table_info_str()

refactor: add chips_rpc() abstraction and poker_vdxf layer

- Add chips_rpc() abstraction in commands.c for REST/CLI switching
- Update vdxf.c to use chips_rpc() for all 9 Verus RPC calls
- Create poker_vdxf.c/h with poker-specific API layer
- Add .rpccredentials config for RPC credentials (REST API)
- Remove unused VDXF functions from public API
- Add ERR_CHIPS_RPC error code

Architecture:
  Application -> poker_vdxf.c -> vdxf.c -> chips_rpc() -> REST/CLI

Simplify README: remove gameplay explanations from node types

- Remove gameplay details from node type descriptions (should be in Verus migration docs)
- Simplify transaction fees note (detailed explanation in docs)

Update README badge to point to sg777/bet for this repo

Fix README badge URL to point to correct repository (sg777/bet)

Remove ARM64 Linux build job and fix macOS artifact wildcard

- Removed linux-build-arm64 job (no runner available)
- Updated macOS artifact naming to be architecture-aware
- Fixed release files section to use wildcard pattern for macOS artifacts
- This allows macOS builds to work on both x86_64 and arm64 runners

Commenting arm64 github workflow in release job

Alpha Testing

Made changes to connect to the channel which are pre-established to fix 

chips-blockchain/pangea-poker#34, added API's to support deposit and withdrawl of funds in multisig address.

Merge pull request chips-blockchain#57 from sg777/master

Fixed: Players show the cards after a fold chips-blockchain#55