chore: import upstream snapshot with attribution

.env.example

@@ -0,0 +1,70 @@
+# API Key (required)
+# Get yours at: https://console.anthropic.com/
+ANTHROPIC_API_KEY=sk-ant-xxx
+
+# Model ID (required)
+MODEL_ID=claude-sonnet-4-6
+
+# Base URL (optional, for Anthropic-compatible providers)
+# ANTHROPIC_BASE_URL=https://api.anthropic.com
+
+# =============================================================================
+#  Anthropic-compatible providers
+#
+#  Provider         MODEL_ID                    Notes                 Base URL
+#  ---------------  --------------------------  --------------------  -------------------
+#  Anthropic        claude-sonnet-4-6           default               (default)
+#  MiniMax          MiniMax-M3                  latest M-series       see below
+#  GLM (Zhipu)      glm-5.2                     latest coding model   see below
+#  Kimi (Moonshot)  kimi-k2.7-code              coding model          see below
+#  DeepSeek         deepseek-v4-pro             pro model             see below
+#                   deepseek-v4-flash           flash model           see below
+#
+#  Check provider docs for current availability, pricing, and regional access.
+# =============================================================================
+
+# ---- International ----
+
+# MiniMax          https://www.minimax.io
+# ANTHROPIC_BASE_URL=https://api.minimax.io/anthropic
+# MODEL_ID=MiniMax-M3
+# MODEL_ID=MiniMax-M2.7
+# MODEL_ID=MiniMax-M2.7-highspeed
+
+# GLM (Zhipu)      https://z.ai
+# ANTHROPIC_BASE_URL=https://api.z.ai/api/anthropic
+# MODEL_ID=glm-5.2
+
+# Kimi (Moonshot)  https://platform.kimi.ai
+# ANTHROPIC_BASE_URL=https://api.moonshot.ai/anthropic
+# MODEL_ID=kimi-k2.7-code
+# MODEL_ID=kimi-k2.7-code-highspeed
+# MODEL_ID=kimi-k2.6
+
+# DeepSeek         https://platform.deepseek.com
+# ANTHROPIC_BASE_URL=https://api.deepseek.com/anthropic
+# MODEL_ID=deepseek-v4-pro
+# MODEL_ID=deepseek-v4-flash
+
+# ---- China mainland ----
+
+# MiniMax          https://platform.minimax.io
+# ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic
+# MODEL_ID=MiniMax-M3
+# MODEL_ID=MiniMax-M2.7
+# MODEL_ID=MiniMax-M2.7-highspeed
+
+# GLM (Zhipu)      https://open.bigmodel.cn
+# ANTHROPIC_BASE_URL=https://open.bigmodel.cn/api/anthropic
+# MODEL_ID=glm-5.2
+
+# Kimi (Moonshot)  https://platform.moonshot.cn
+# ANTHROPIC_BASE_URL=https://api.moonshot.cn/anthropic
+# MODEL_ID=kimi-k2.7-code
+# MODEL_ID=kimi-k2.7-code-highspeed
+# MODEL_ID=kimi-k2.6
+
+# DeepSeek (no regional split, same endpoint globally)
+# ANTHROPIC_BASE_URL=https://api.deepseek.com/anthropic
+# MODEL_ID=deepseek-v4-pro
+# MODEL_ID=deepseek-v4-flash