docs: add v1.8.0 server release notes and product update entry

[blue4209211]

Summary

• Adds v1.8.0 server release notes under doc-server/docs/releases/server/1.8.0.md
• Updates Recent Releases list on doc-server/docs/releases/server/index.md
• Adds product update announcement entry for 1.8.0 in product-updates/product_updates.json

[gemini-code-assist]

Code Review

This pull request adds the release notes and documentation updates for NudgeBee version 1.8.0, including a new release notes markdown file, an updated index, and a product updates JSON entry. The feedback suggests removing a redundant 'Fix' verb immediately following the 'fix:' prefix in one of the release notes entries to improve phrasing.

[VanshikaR7]

QA pass against nudgebee-enterprise commits since v1.7.0 (2026-08-24):

Remove — duplicate bullet. Only one commit exists for the alert-rule unique-key fix (db4eb6e0 fix(collector): target the current event_rules unique key in alert-rule upserts), but it's listed twice under two different sections with reworded text:

• Troubleshoot: "Target the current 4-column unique key in collector alert-rule upserts to prevent batch rollback"
• Integrations: "Target the current 4-column unique constraint on event_rules upserts to prevent integration sync rollbacks"

Drop one of these.

Check — possibly missing. These merged since 1.7.0 and don't appear anywhere in the draft; confirm intentional before merging:

• 266021d7 feat(nb-35407): surface package vulnerabilities on cloud accounts and EC2 instances
• 5c2cc851 fix(ui): verify Slack webhook signature over the raw request body
• efbf453d fix(llm-server): block secret reads through workspace shims
• 34402709 fix(deps): resolve npm audit security vulnerabilities in app

Note: I spot-checked against the ~270 commits on main since the last release rather than reconciling every commit 1:1, so this isn't exhaustive — but the duplicate above is confirmed.

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