[19.0][ADD] ormgraph_odoo: Live architecture & interactive ERD studio

[iam-piyush]

Description

This PR introduces ormgraph_odoo, an interactive architecture intelligence tool, visual ERD studio, and relational dependency pathfinder for Odoo models.

Key Capabilities

• Zero-Load Architecture Canvas: Module-by-module isolated model exploration powered by Cytoscape.js.
• Interactive ERD Schema Cards: Draggable database table cards with color-coded badges for relational, numeric, boolean, computed, and selection fields.
• BFS Relational Pathfinder: Computes the shortest relational route between any two database models with copyable Python ORM dot-paths (partner_id.currency_id.symbol).
• Smart Cluster ZIP Exporter: Automatically partitions modules with >20 models into isolated Hub sub-graph diagrams.
• Architecture Health: Real-time diagnostic dashboard detecting circular dependencies and isolated models.
• Odoo Smart Button: Direct "Architecture Visualizer" action on Model forms.

Documentation & Credits

• Author: Piyush Kumar (@iam-piyush)
• Website: https://iampiyush.one
• License: LGPL-3

[pedrobaeza]

Subprojects are not valid here.

[iam-piyush]

Hey @pedrobaeza, sorry for the mess earlier!

The first push had a nested .git inside the module folder which made git treat it as a submodule. Fixed that, also updated route type to jsonrpc for Odoo 19 and added proper http tests.

@ocabot autofix

[iam-piyush]

Closing this PR. The module includes a bundled React/Next.js frontend
studio which doesn't fit OCA's standard module structure.
Will maintain it as a standalone open-source Odoo module.

Thanks @pedrobaeza for the review!