Adds field validators to CreateSSEMCPServer, CreateStreamableHTTPMCPServer,
and their Update counterparts to validate that server_url fields:
- Start with 'http://' or 'https://'
- Have a valid host
This prevents errors like 'httpx.UnsupportedProtocol: Request URL has an
unsupported protocol 'hthttps://'' caused by user input typos.
Fixes#8078👾 Generated with [Letta Code](https://letta.com)
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Co-authored-by: Kian Jones <11655409+kianjones9@users.noreply.github.com>
* refactor: migrate mcp_servers and mcp_oauth to encrypted-only columns
Complete migration to encrypted-only storage for sensitive fields:
- Remove dual-write to plaintext columns (token, custom_headers,
authorization_code, access_token, refresh_token, client_secret)
- Read only from _enc columns, not from plaintext fallback
- Remove helper methods (get_token_secret, set_token_secret, etc.)
- Remove Secret.from_db() and Secret.to_dict() methods
- Update tests to verify encrypted-only behavior
After this change, plaintext columns can be set to NULL manually
since they are no longer read from or written to.
* fix test
* rename
* update
* union
* fix test
