Feat/entity relation diagram

[CyprienKelma]

This PR simply add a way to generate a EDR (UML) schema directly from dbt models.
It's useful here to generate a proper Mermaid UML schema of Fact and Dim tables.

To use it simply do :
cd dbt
python -m dbt_erd --model-path models/mart --config erd_config.yml

[Copilot]

Pull request overview

This PR adds Entity Relationship Diagram (ERD) generation capabilities to the dbt project using the dbt-model-erd package. The implementation enables automatic generation of Mermaid UML diagrams from dbt model definitions and relationships, specifically for the star schema fact and dimension tables.

• Adds dbt-model-erd>=0.1.1 dependency for ERD generation
• Updates model naming from single to double underscores (dim__users, fct__viewings)
• Modernizes GitHub Actions workflow to use uv for dependency management

Reviewed changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
pyproject.toml	Adds dbt-model-erd dependency to project requirements
uv.lock	Updates lock file with dbt-model-erd package and related dependencies including newer platform-specific greenlet wheels
dbt/erd_config.yml	Configuration file for ERD generation with naming patterns, visualization settings, and Mermaid output options
dbt/models/mart/core/dim__users/dim__users.yml	Updates model name to double underscore convention and removes age range validation test
dbt/models/mart/core/dim__content/dim__content.yml	Updates model name to double underscore convention
dbt/models/mart/core/dim__devices/dim__devices.yml	Updates model name and adds incorrectly-directed relationship test
dbt/models/mart/core/dim__date/dim__date.yml	Updates model name, removes week_number range validation, and updates description
dbt/models/mart/core/fct__viewings/fct__viewings.yml	Updates model name and foreign key descriptions to match new naming convention
dbt/assets/img/mart/core/fct__viewings/fct__viewings_model.mmd	Generated Mermaid diagram source file for fact table ERD
dbt/assets/img/mart/core/fct__viewings/fct__viewings_model.html	Generated interactive HTML visualization with download capabilities
.github/workflows/publish-dbt-doc.yml	Modernizes workflow to use uv for dependency management and adds compile step before docs generation
debug_manifest.py	Adds debug script for inspecting dbt manifest structure
test.excalidraw.png	Test artifact that should not be committed
logs/dbt.log	Debug logs that should not be committed

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