fix: declare zod runtime deps for TS servers

[xianzuyang9-blip]

Summary

• declare zod as a runtime dependency for the filesystem, memory, and sequential-thinking server packages
• sync package-lock.json so strict package managers install zod with each published server package that imports it directly

Why

src/filesystem/index.ts, src/memory/index.ts, and src/sequentialthinking/index.ts all import zod directly. Without a direct package dependency, strict package managers can omit a co-located zod install for these published packages and the server entrypoints can fail with ERR_MODULE_NOT_FOUND.

Verification

pm install --package-lock-only --ignore-scripts

pm install --ignore-scripts

pm run build -w src/sequentialthinking

pm run build -w src/memory

pm run build -w src/filesystem

pm run test -w src/sequentialthinking (14 passed)

pm run test -w src/memory (45 passed)

pm run test -w src/filesystem (147 passed; symlink-only cases skipped by test suite on Windows)

• static dependency check: every workspace package that directly imports zod now declares dependencies.zod

Fixes #4288