API key authentication using Bearer token format.
Format: Authorization: Bearer vg_your_api_key_here
API keys follow the pattern: vg_[12_hex_chars]_[32_base64url_chars]
Investor name (fuzzy search with relevance scoring)
Investor website domain (exact match)
Full LinkedIn company URL (e.g., https://linkedin.com/company/sequoia-capital). Bare slugs like "sequoia-capital" are rejected — a full URL is required.
Full Crunchbase organization URL (e.g., https://crunchbase.com/organization/sequoia-capital). Bare slugs like "sequoia-capital" are rejected — a full URL is required.