feat(fusion_accounting_documents): Documents app <-> invoice bridge

Replaces Enterprise's documents_account with a Fusion-native bridge.
When a PDF/image lands in the Documents app, users can convert it
into a draft vendor bill via a wizard that copies the document's
binary onto the new account.move and posts a chatter note linking
back to the source document.

Adds:
- documents.document.move_id (Many2one to the linked invoice)
- documents.document.is_invoice_candidate (computed; True for
  unlinked PDF/image binaries)
- documents.document.action_create_invoice() opens the wizard
- account.move.source_document_ids reverse linkage + statinfo button
- fusion.create.invoice.from.document.wizard (TransientModel + form)
- ir.actions.server bound to documents.document so the workflow
  appears in the kanban/list Actions menu (the Documents app has
  no regular form view to inherit from in v19)

The wizard:
- defaults to the company's first purchase journal
- supports vendor bill or vendor credit note
- copies the source attachment onto the new move
- posts a chatter note linking back
- marks the document linked so it stops appearing as a candidate

Auto-installs when documents + fusion_accounting_core are both
present. 8 unit tests cover the candidate flag, wizard happy path,
attachment copy, reverse linkage, already-linked guard, non-PDF
guard, and credit-note creation.

Made-with: Cursor

fusion_accounting_documents/wizards/__init__.py

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+from . import create_invoice_from_document

fusion_accounting_documents/wizards/create_invoice_from_document.py

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+"""Wizard to create a vendor invoice from a Documents document.
+
+The wizard creates an empty draft ``account.move`` of the chosen
+move type, copies the document's binary attachment onto the new
+move, posts a chatter note linking back to the source document,
+and finally stores the move on ``documents.document.move_id`` so
+the source no longer appears as an invoice candidate.
+"""
+
+from odoo import _, api, fields, models
+from odoo.exceptions import UserError
+
+
+MOVE_TYPE_LABELS = {
+    'in_invoice': _('Vendor Bill'),
+    'in_refund': _('Vendor Credit Note'),
+}
+
+
+class CreateInvoiceFromDocumentWizard(models.TransientModel):
+    _name = 'fusion.create.invoice.from.document.wizard'
+    _description = 'Create Vendor Invoice from Document'
+
+    document_id = fields.Many2one(
+        'documents.document',
+        string='Source Document',
+        required=True,
+        readonly=True,
+        ondelete='cascade',
+    )
+    document_name = fields.Char(related='document_id.name', readonly=True)
+    document_mimetype = fields.Char(related='document_id.mimetype', readonly=True)
+
+    partner_id = fields.Many2one(
+        'res.partner',
+        string='Vendor',
+        domain="[('supplier_rank', '>', 0)]",
+    )
+    move_type = fields.Selection(
+        [
+            ('in_invoice', 'Vendor Bill'),
+            ('in_refund', 'Vendor Credit Note'),
+        ],
+        string='Type',
+        default='in_invoice',
+        required=True,
+    )
+    company_id = fields.Many2one(
+        'res.company',
+        string='Company',
+        default=lambda self: self.env.company,
+        required=True,
+    )
+    journal_id = fields.Many2one(
+        'account.journal',
+        string='Journal',
+        domain="[('type', '=', 'purchase'), ('company_id', '=', company_id)]",
+        default=lambda self: self._default_journal(),
+    )
+
+    @api.model
+    def _default_journal(self):
+        return self.env['account.journal'].search(
+            [('type', '=', 'purchase'),
+             ('company_id', '=', self.env.company.id)],
+            limit=1,
+        )
+
+    @api.onchange('company_id')
+    def _onchange_company_id(self):
+        if self.journal_id and self.journal_id.company_id != self.company_id:
+            self.journal_id = self.env['account.journal'].search(
+                [('type', '=', 'purchase'),
+                 ('company_id', '=', self.company_id.id)],
+                limit=1,
+            )
+
+    def action_create_invoice(self):
+        self.ensure_one()
+        if not self.document_id:
+            raise UserError(_("No document selected."))
+        if self.document_id.move_id:
+            raise UserError(_(
+                "Document %(doc)s is already linked to invoice %(inv)s.",
+                doc=self.document_id.display_name,
+                inv=self.document_id.move_id.display_name,
+            ))
+        if not self.journal_id:
+            raise UserError(_(
+                "No purchase journal configured for company %s.",
+                self.company_id.display_name,
+            ))
+
+        move_vals = {
+            'move_type': self.move_type,
+            'journal_id': self.journal_id.id,
+            'company_id': self.company_id.id,
+        }
+        if self.partner_id:
+            move_vals['partner_id'] = self.partner_id.id
+
+        move = self.env['account.move'].create(move_vals)
+
+        attachment = self.document_id.attachment_id
+        if attachment:
+            attachment_copy = attachment.copy({
+                'res_model': 'account.move',
+                'res_id': move.id,
+            })
+            move.message_post(
+                body=_(
+                    "Created from Documents source: <strong>%s</strong>",
+                    self.document_id.name,
+                ),
+                attachment_ids=[attachment_copy.id],
+            )
+        else:
+            move.message_post(body=_(
+                "Created from Documents source: <strong>%s</strong> "
+                "(no attachment to copy).",
+                self.document_id.name,
+            ))
+
+        self.document_id.move_id = move.id
+
+        return {
+            'type': 'ir.actions.act_window',
+            'name': MOVE_TYPE_LABELS.get(self.move_type, _('Invoice')),
+            'res_model': 'account.move',
+            'view_mode': 'form',
+            'res_id': move.id,
+        }

fusion_accounting_documents/wizards/create_invoice_from_document_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_create_invoice_from_document_wizard_form" model="ir.ui.view">
+        <field name="name">fusion.create.invoice.from.document.wizard.form</field>
+        <field name="model">fusion.create.invoice.from.document.wizard</field>
+        <field name="arch" type="xml">
+            <form string="Create Invoice from Document">
+                <sheet>
+                    <group>
+                        <field name="document_id" invisible="1"/>
+                        <field name="document_name" readonly="1"/>
+                        <field name="document_mimetype" readonly="1"/>
+                    </group>
+                    <group>
+                        <field name="move_type"/>
+                        <field name="partner_id" options="{'no_create': True}"/>
+                        <field name="company_id"
+                               groups="base.group_multi_company"
+                               options="{'no_create': True}"/>
+                        <field name="journal_id" options="{'no_create': True}"/>
+                    </group>
+                </sheet>
+                <footer>
+                    <button name="action_create_invoice"
+                            string="Create Invoice"
+                            type="object"
+                            class="btn-primary"
+                            data-hotkey="q"/>
+                    <button string="Cancel"
+                            class="btn-secondary"
+                            special="cancel"
+                            data-hotkey="x"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+</odoo>