feat: Add WhatsApp poll support (#248)

Implements issue #123 - WhatsApp Poll Support

## Gateway Protocol
- Add `poll` RPC method with params: to, question, options (2-12), selectableCount

## ActiveWebListener
- Add `sendPoll(to, poll)` method to interface
- Implementation uses Baileys poll message type

## CLI Command
- `clawdbot poll --to <jid> -q <question> -o <opt1> -o <opt2> [-s count]`
- Supports --dry-run, --json, --verbose flags
- Validates 2-12 options

## Changes
- src/gateway/protocol/schema.ts: Add PollParamsSchema
- src/gateway/protocol/index.ts: Export validator and types
- src/web/active-listener.ts: Add sendPoll to interface
- src/web/inbound.ts: Implement sendPoll using Baileys
- src/web/outbound.ts: Add sendPollWhatsApp function
- src/gateway/server-methods/send.ts: Add poll handler
- src/commands/poll.ts: New CLI command
- src/cli/program.ts: Register poll command

Closes #123

src/gateway/protocol/index.ts

@@ -79,6 +79,8 @@ import {
   type ResponseFrame,
   ResponseFrameSchema,
   SendParamsSchema,
+  type PollParams,
+  PollParamsSchema,
   type SessionsCompactParams,
   SessionsCompactParamsSchema,
   type SessionsDeleteParams,
@@ -147,6 +149,7 @@ export const validateResponseFrame =
   ajv.compile<ResponseFrame>(ResponseFrameSchema);
 export const validateEventFrame = ajv.compile<EventFrame>(EventFrameSchema);
 export const validateSendParams = ajv.compile(SendParamsSchema);
+export const validatePollParams = ajv.compile<PollParams>(PollParamsSchema);
 export const validateAgentParams = ajv.compile(AgentParamsSchema);
 export const validateAgentWaitParams = ajv.compile<AgentWaitParams>(
   AgentWaitParamsSchema,
@@ -282,6 +285,7 @@ export {
   AgentEventSchema,
   ChatEventSchema,
   SendParamsSchema,
+  PollParamsSchema,
   AgentParamsSchema,
   WakeParamsSchema,
   NodePairRequestParamsSchema,
@@ -390,4 +394,5 @@ export type {
   CronRunParams,
   CronRunsParams,
   CronRunLogEntry,
+  PollParams,
 };