feat: Add Chatwoot Agent Bot prototype and FAQ knowledge base

- Created chatwoot-agent-bot/ with Node.js webhook server
- Bot detects intent (greeting, billing, technical, features, account)
- Auto-responds from FAQ knowledge base or escalates to human
- FAQ-KB.md: Living knowledge base that grows with customer questions
- CHATWOOT-SETUP.md: Complete deployment and configuration guide
- Supports Telegram notifications on escalation
- Bot runs on port 3001, ready for Chatwoot webhook integration

chatwoot-agent-bot/node_modules/iconv-lite/lib/bom-handling.js

@@ -0,0 +1,48 @@
+"use strict"
+
+var BOMChar = "\uFEFF"
+
+exports.PrependBOM = PrependBOMWrapper
+function PrependBOMWrapper (encoder, options) {
+  this.encoder = encoder
+  this.addBOM = true
+}
+
+PrependBOMWrapper.prototype.write = function (str) {
+  if (this.addBOM) {
+    str = BOMChar + str
+    this.addBOM = false
+  }
+
+  return this.encoder.write(str)
+}
+
+PrependBOMWrapper.prototype.end = function () {
+  return this.encoder.end()
+}
+
+// ------------------------------------------------------------------------------
+
+exports.StripBOM = StripBOMWrapper
+function StripBOMWrapper (decoder, options) {
+  this.decoder = decoder
+  this.pass = false
+  this.options = options || {}
+}
+
+StripBOMWrapper.prototype.write = function (buf) {
+  var res = this.decoder.write(buf)
+  if (this.pass || !res) { return res }
+
+  if (res[0] === BOMChar) {
+    res = res.slice(1)
+    if (typeof this.options.stripBOM === "function") { this.options.stripBOM() }
+  }
+
+  this.pass = true
+  return res
+}
+
+StripBOMWrapper.prototype.end = function () {
+  return this.decoder.end()
+}