[7030][ADD] product_weighing: append-only weighing lines with product Weighing tab

[nobuQuartile]

QT7030

What

Add a new module product_weighing that stores weighing results sent from the external odoo-upload-system against a product.

Why

The weighing data is used to back a "no tampering of weighing data" claim, so the detail model must be append-only.

How

• New model product.weighing.line (gross/dust/net weight, weighing id, measured at, image hash), weighing_id SQL unique.
• Append-only, no escape: creation is limited to a dedicated group_weighing_integration via ACL (no write/unlink granted to anyone), and the model overrides write/unlink to always raise AccessError. So a line can never be modified or deleted after creation through any ORM path — UI, RPC, sudo or the developer-mode superuser included; there is no context flag to bypass it. Direct SQL is out of scope by design.
• Trail preserved: product_tmpl_id is ondelete="restrict", so a product with weighing lines cannot be deleted (no cascade erasure of the evidence).
• product.template gets three computed+stored aggregate fields (weighing count, total net weight, weighing confirmed at) plus the one2many. The integration only creates lines — it never writes to product.template.
• No mail.thread / no field tracking on the line: there is no chatter view for the line and, being append-only, it never changes, so tracking would add cost with no auditable effect. A searchable audit trail (create/write/unlink of the line, plus permission changes) is intended to be provided by the OCA auditlog module as a follow-up (module to be vendored into rmm-oca).
• Read-only Weighing tab on the product form (matches the requested mockup: no add/delete, row click opens a read-only detail with the image hash).
• Japanese translation (i18n/ja.po) and tests.

Test

-u product_weighing --test-enable → 3/3 pass. Covered: integration user create OK; create denied for regular/admin; write and unlink raise for everyone incl. sudo; product with lines cannot be deleted (restrict); duplicate weighing_id rejected; aggregates computed.

[AungKoKoLin1997]

Code Review: LG

[nobuQuartile]

Add ja.po

Translation notes

Translations are referenced from existing Odoo translations where available (odoo/product).

The following terms have no reference and are translated independently:

msgid	msgstr
<strong>A weighing line has been added.</strong>	<strong>計量明細が追加されました。</strong>
A weighing line with this Weighing ID already exists.	この計量IDの計量明細は既に存在します。
Breakdown of deducted items (e.g. 'cage cart x2, cart x1').	控除品目の内訳（例:「かご台車×2, 台車×1」）。
Dust Deduction Detail	ダスト控除内訳
Dust Deduction Weight (kg)	ダスト控除重量(kg)
External weighing identifier (e.g. WEIGH-KNG-20260513-0001).	外部計量ID（例: WEIGH-KNG-20260513-0001）。
Gross Weight (kg)	総重量(kg)
Image Hash	画像ハッシュ
Measured At	計測日時
Measured At:	計測日時:
Measurer	計測者
Net Weight (kg)	正味重量(kg)
Net Weight (kg):	正味重量(kg):
Receipt No.	レシート番号
SHA-256 of the evidence image(s), comma-separated, for tamper verification.	証跡画像のSHA-256（複数の場合はカンマ区切り）。改ざん検証用。
Total Net Weight	合計正味重量
Users allowed to create weighing lines via the external integration (odoo-upload-system).	外部連携（odoo-upload-system）経由で計量明細を作成できるユーザ。
Weighing	計量
Weighing Confirmed At	計量確定日時
Weighing Count	計量数
Weighing ID	計量ID
Weighing ID:	計量ID:
Weighing Integration	計量連携
Weighing Line	計量明細
Weighing Lines	計量明細
Weighing line	計量明細
Weighing lines are append-only and cannot be deleted.	計量明細は追記専用のため削除できません。
Weighing lines are append-only and cannot be modified.	計量明細は追記専用のため変更できません。
has been updated.	が更新されました。

[smorita7749]

Code and functional review: LGTM