feat: add missing [providers.moonshot] section to config.example.toml

Moonshot/Kimi is a shipped provider with full support (model registry entry,
provider ID, env var plumbing, CLI provider picker), but config.example.toml
was missing its [providers.moonshot] table block while all other 15 providers
had one. This made Moonshot the only shipped provider absent from the example.

Added the section between siliconflow and sglang, matching the shipped-provider
ordering in docs/PROVIDERS.md. Includes the Kimi Code alternate path and
kimi_oauth auth_mode comment.

config.example.toml

@@ -305,6 +305,16 @@ max_subagents = 10 # optional (1-20)
 # base_url = "https://api.siliconflow.com/v1"
 # model = "deepseek-ai/DeepSeek-V4-Pro"     # or deepseek-ai/DeepSeek-V4-Flash
 
+# Moonshot/Kimi OpenAI-compatible endpoint (https://platform.moonshot.ai)
+[providers.moonshot]
+# api_key = "YOUR_MOONSHOT_API_KEY"           # or KIMI_API_KEY
+# base_url = "https://api.moonshot.ai/v1"      # or KIMI_BASE_URL
+# model = "kimi-k2.6"
+# # Kimi Code path:
+# # base_url = "https://api.kimi.com/coding/v1"
+# # model = "kimi-for-coding"
+# # auth_mode = "kimi_oauth"                   # reads Kimi CLI OAuth credentials
+
 # Self-hosted SGLang OpenAI-compatible server
 [providers.sglang]
 # api_key = "OPTIONAL_SGLANG_TOKEN"