chore: add database diagram generator

docs/TASKS/development/002-generate-database-diagram.md

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+# Task: Add database diagram generation script
+
+## Goal
+
+Provide a repeatable local command that renders the current PostgreSQL schema as a visual database diagram for human review.
+
+The output should be local generated artifacts, not checked-in schema snapshots, so the diagram can be refreshed whenever EF migrations or model configuration change.
+
+## Relevant Files
+
+- `scripts/generate-db-diagram.sh`
+- `.gitignore`
+- `README.md`
+
+## Validation
+
+```bash
+./scripts/generate-db-diagram.sh
+```
+
+Open:
+
+```txt
+.artifacts/db-diagrams/database-diagram.html
+```