Initial open source release

.env.example

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+# Optional. Defaults to ~/.wechat-radar
+WECHAT_RADAR_DATA_DIR=
+
+# Comma-separated names used to detect messages that mention you.
+# Example: WECHAT_RADAR_MY_NAMES=张三,San Zhang,zhangsan
+WECHAT_RADAR_MY_NAMES=
+
+# Use demo data when wx-cli is unavailable. Set to 1 to enable.
+WECHAT_RADAR_DEMO=0
+
+# Optional model name used by Codex CLI based topic/link summarization.
+WECHAT_RADAR_CODEX_MODEL=