fix: merge members llm prompt

[joanagmaia]

This PR follows this discussion https://linuxfoundation.slack.com/archives/C06ULRCFJF8/p1763982626411879.
This PR updates the LLM prompt to automatically merge member profiles and to make it a lot more strict when it comes to merging profiles with different identities for the same platform.

Even with the pro tip we saw a lot of merges that had different values for the same platform.

---

Note

Tightens the LLM prompt in mergeMembersWithLLM.ts to enforce a first-step rule: never merge when identities share the same platform but have different values.

• LLM prompt update in services/apps/merge_suggestions_worker/src/workflows/mergeMembersWithLLM.ts:
  • Adds a strict, first-priority rule to return false when both members have identities on the same platform but with different values, regardless of other similarities.
  • Keeps existing similarity guidance but clarifies evaluation order and emphasis.

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