docs(errors): document mongoose.model() init-order time bomb in standalone scripts

[PierreBrisorgueil]

Summary

• Appends one entry to ERRORS.md documenting the MissingSchemaError init-order time bomb triggered when a repository uses top-level mongoose.model() and is imported from a standalone script (cron, migration) before loadModels() runs.
• Captures symptom, root cause (ESM DFS eval order), why tests miss it (jest mock intercepts), and both fix patterns (lazy getter / dynamic import after load).

Closes #3789

Test plan

• Doc-only change — no code modified, no tests needed.
• Entry matches existing ERRORS.md one-liner format.

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Reviewing files that changed from the base of the PR and between 690e756 and 2670b65.

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• ERRORS.md

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/errors-mongoose-init-order

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Pull request overview

Adds a new entry to ERRORS.md documenting an ESM init-order pitfall where top-level mongoose.model() lookups in repository modules can crash standalone scripts (crons/migrations) with MissingSchemaError when models haven’t been registered yet.

Changes:

• Appends a one-line ERRORS.md entry describing the mongoose.model() import-time evaluation hazard in standalone scripts, why tests may miss it, and the two recommended mitigation patterns (lazy model getter or dynamic import after loadModels()).