Fetches the specific deposit address for the TronSave internal account. Requires a logged-in MCP session created by the `tronsave_login` tool: include `mcp-session-id: <sessionId>` returned by `tronsave_login` on subsequent MCP requests. Internal tools never accept API keys via tool arguments; signature sessions resolve the latest internal API key on demand, while api-key sessions reuse the validated key from login. Trigger this tool if the user asks for a deposit address or needs to top up their TronSave TRX balance. Constraints: 1) TRX only; 2) Minimum deposit amount is 10 TRX; 3) Read-only operation.