docs(ton): update protocol contracts

src/pages/developers/protocol/ton.md

@@ -0,0 +1,107 @@
+# TON Gateway Docs
+
+## gateway.fc
+
+### Constants
+
+-   **op::internal::donate** = 100
+-   **op::internal::deposit** = 101
+-   **op::internal::deposit_and_call** = 102
+-   **op::internal::call** = 103
+-   **op::external::withdraw** = 200
+-   **op::external::increase_seqno** = 205
+-   **op::authority::set_deposits_enabled** = 201
+-   **op::authority::update_tss** = 202
+-   **op::authority::update_code** = 203
+-   **op::authority::update_authority** = 204
+-   **op::authority::reset_seqno** = 206
+
+### `handle_deposit`
+
+```func
+() handle_deposit(int amount, slice in_msg_body) impure inline {
+```
+
+Deposit TON to the gateway and specify the EVM recipient on ZetaChain
+
+### `handle_call`
+
+```func
+() handle_call(int amount, slice in_msg_body) impure inline {
+```
+
+Handles zeta's onCall method by ensuring call_data size and gas costs are covered;
+
+NOTE that this operation DOESN'T rebate sent amount if it's bigger than tx fee!
+We can consider sending surplus amount back in the future improvements.
+For now, send amount that is equal to calculate_gas_fee(op::call)
+
+### `handle_set_deposits_enabled`
+
+```func
+() handle_set_deposits_enabled(slice sender, slice message) impure inline {
+```
+
+Enables or disables deposits.
+
+### `handle_update_tss`
+
+```func
+() handle_update_tss(slice sender, slice message) impure inline {
+```
+
+Updates the TSS address. WARNING! Execute with extra caution.
+Wrong TSS address leads to loss of funds.
+
+### `handle_update_code`
+
+```func
+() handle_update_code(slice sender, slice message) impure inline {
+```
+
+Updated the code of the contract
+Handle_code_update (cell new_code)
+
+### `handle_reset_seqno`
+
+```func
+() handle_reset_seqno(slice sender, slice message) impure inline {
+```
+
+Resets the seqno to the specified value
+Handles reset_seqno (uint32 new_seqno)
+
+### `recv_internal`
+
+```func
+() recv_internal(int my_balance, int msg_value, cell in_msg_full, slice in_msg_body) impure {
+```
+
+Input for all internal messages
+
+### `handle_withdrawal`
+
+```func
+() handle_withdrawal(slice payload) impure inline {
+```
+
+Withdraws assets to the recipient
+
+Handle_withdrawal (MsgAddr recipient, Coins amount, uint32 seqno)
+
+### `handle_increase_seqno`
+
+```func
+() handle_increase_seqno(slice payload) impure inline {
+```
+
+Increases seqno by 1 without doing any other operations.
+Handle_increase_seqno (uint32 failure_reason, uint32 seqno)
+
+### `recv_external`
+
+```func
+() recv_external(slice message) impure {
+```
+
+Entry point for all external messages