fix(cloudstore): invalidate dashboard read model cache on mutation insert

[idrojone]

🔗 Linked Issue

Closes #251

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🏷️ PR Type

• type:bug — Bug fix
• type:feature — New feature
• type:docs — Documentation only
• type:refactor — Code refactoring (no behavior change)
• type:chore — Maintenance, dependencies, tooling
• type:breaking-change — Breaking change

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📝 Summary

• Invalidate dashboard read model cache after successful mutation batch insert.
• Add focused regression test for InsertMutationBatch cache invalidation.

📂 Changes

File	Change
internal/cloud/cloudstore/cloudstore.go	Invalidate dashboard read model cache after mutation insert commit.
internal/cloud/cloudstore/project_controls_test.go	Add regression test for cache invalidation on InsertMutationBatch.

🧪 Test Plan

• Unit tests pass locally: go test ./...
• E2E tests pass locally: go test -tags e2e ./internal/server/...
• Manually tested the affected functionality

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🤖 Automated Checks

Check	What it verifies	Status
Check Issue Reference	PR body contains Closes #N / Fixes #N / Resolves #N	⏳
Check Issue Has status:approved	Linked issue has status:approved label	⏳
Check PR Has type: Label*	PR has exactly one type:* label	⏳
Unit Tests	go test ./... passes	⏳
E2E Tests	go test -tags e2e ./internal/server/... passes	⏳

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✅ Contributor Checklist

• I linked an approved issue above (Closes #N)
• I added exactly one type:* label to this PR
• I ran unit tests locally: go test ./...
• I ran e2e tests locally: go test -tags e2e ./internal/server/...
• Docs updated (if behavior changed)
• Commits follow conventional commits format
• No Co-Authored-By trailers in commits

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💬 Notes for Reviewers

Scoped to #251 only: cache invalidation fix + regression test. No Docker Compose or .gitignore changes.

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[Alan-TheGentleman]

Thanks for the focused fix. The actual cache invalidation change is correct, but I am not going to merge this PR while it also changes Docker Compose defaults and .gitignore.

Please keep this PR scoped to #251: leave the cs.invalidateDashboardReadModel() call, add a focused regression test for InsertMutationBatch, and remove the unrelated .gitignore and docker-compose.cloud.yml changes. The Compose changes are especially risky because they replace zero-config local defaults with required env vars and change localhost-only bindings to 0.0.0.0. Once the PR is scoped down, I can review it on the actual bug fix.

[idrojone]

Thanks for the review. You’re right about the scope.
Clarifying: the changes in .gitignore and docker-compose.cloud.yml were mine just for testing, but they shouldn’t be in this PR. I pushed them without realizing it, thanks for catching that.
I’ve removed them and kept PR #253 strictly scoped to #251:

• cs.invalidateDashboardReadModel() remains at the end of InsertMutationBatch.
• I added a focused regression test in project_controls_test.go.
• I removed the .gitignore and docker-compose.cloud.yml changes.