pub fn read_env_var_key() -> Option<Vec<String>>Expand description
Layer 1: reads keys from the CONTEXT7_API_KEYS runtime environment variable.
Accepts multiple comma-separated keys:
CONTEXT7_API_KEYS=ctx7sk-a,ctx7sk-b,ctx7sk-c
Whitespace around each key is trimmed automatically.
Returns None if the variable is not set or is empty.