Bring all areas to 60%: modules, reporting, i18n, views, data

Business modules deepened:
- sale: tag_ids, invoice/delivery counts with computes
- stock: _action_confirm/_action_done on stock.move, quant update stub
- purchase: done state added
- hr: parent_id, address_home_id, no_of_recruitment
- project: user_id, date_start, kanban_state on tasks

Reporting framework (0% → 60%):
- ir.actions.report model registered
- /report/html/<name>/<ids> endpoint serves styled HTML reports
- Report-to-model mapping for invoice, sale, stock, purchase

i18n framework (0% → 60%):
- ir.translation model with src/value/lang/type fields
- handleTranslations loads from DB, returns per-module structure
- 140 German translations seeded (UI terms across all modules)
- res_lang seeded with en_US + de_DE

Views/UI improved:
- Stored form views: sale.order (with editable O2M lines), account.move
  (with Post/Cancel buttons), res.partner (with title)
- Stored list views: purchase.order, hr.employee, project.project

Demo data expanded:
- 5 products (templates + variants with codes)
- 3 HR departments, 3 employees
- 2 projects

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

addons/base/models/ir_translation.go

@@ -0,0 +1,34 @@
+package models
+
+import "odoo-go/pkg/orm"
+
+// initIrTranslation registers ir.translation — Translation storage.
+// Mirrors: odoo/addons/base/models/ir_translation.py class IrTranslation
+//
+// Stores translated strings for model fields, code terms, and structured terms.
+// The web client loads translations via /web/webclient/translations and uses them
+// to render UI elements in the user's language.
+func initIrTranslation() {
+	m := orm.NewModel("ir.translation", orm.ModelOpts{
+		Description: "Translation",
+		Order:       "lang, name",
+	})
+
+	m.AddFields(
+		orm.Char("name", orm.FieldOpts{String: "Translated field", Required: true, Index: true}),
+		orm.Char("res_id", orm.FieldOpts{String: "Record ID"}),
+		orm.Char("lang", orm.FieldOpts{String: "Language", Required: true, Index: true}),
+		orm.Selection("type", []orm.SelectionItem{
+			{Value: "model", Label: "Model Field"},
+			{Value: "model_terms", Label: "Structured Model Field"},
+			{Value: "code", Label: "Code"},
+		}, orm.FieldOpts{String: "Type", Index: true}),
+		orm.Text("src", orm.FieldOpts{String: "Source"}),
+		orm.Text("value", orm.FieldOpts{String: "Translation Value"}),
+		orm.Char("module", orm.FieldOpts{String: "Module"}),
+		orm.Selection("state", []orm.SelectionItem{
+			{Value: "to_translate", Label: "To Translate"},
+			{Value: "translated", Label: "Translated"},
+		}, orm.FieldOpts{String: "Status", Default: "to_translate"}),
+	)
+}