Add CN86 SMS keyword verification skill and README

cn86-sms-keyword-verification/agents/openai.yaml

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+interface:
+  display_name: "CN86 SMS Keyword Verification"
+  short_description: "Get 86 phone numbers and OTP codes via LubanSMS keyword APIs"
+  default_prompt: "Use LubanSMS keyword APIs to request an 86 phone number, poll SMS by keyword, extract the OTP code, and release the number for flows like Qwen SMS login."