Update @modelcontextprotocol/sdk to 1.23.0 in TypeScript servers (#3065)

Update the SDK from ^1.19.1 to ^1.23.0 in all TypeScript reference servers:
- everything
- filesystem
- memory
- sequentialthinking

Also update everything server for SDK breaking changes:
- Update zod to ^3.25.0 (zod v4 compatibility)
- Fix ToolInput/ToolOutput types to use Tool["inputSchema"] instead of
  inferring from zod schemas
- Fix result.content handling to support array format

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

Author: domdomegg