[16.0][ADD] stock_picking_signature

[eantones]

Summary

Odoo 16 has a basic signature field on stock pickings, but it's limited to outgoing deliveries only and lacks metadata tracking. This module extends it:

• Configurable per picking type: Require Signature option on operation types enables signature requirements for any transfer type (receipts, deliveries, internal transfers)
• Signature metadata: Signed By and Signed On fields auto-populated when a signature is captured
• Validation enforcement: transfers with required signature cannot be validated without one
• Extended reports: signature block added to Picking Operations report (in addition to the existing Delivery Slip)
• Signature tab: dedicated notebook tab on the picking form with signature details
• Catalan and Spanish translations included

Note: the native "Signature" setting in Inventory Settings must also be enabled (two-tier control).

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.19%. Comparing base (8114287) to head (4d9364a).

Files with missing lines	Patch %	Lines
stock_picking_signature/models/stock_picking.py	36.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             16.0     #858      +/-   ##
==========================================
+ Coverage   43.15%   43.19%   +0.03%     
==========================================
  Files         302      306       +4     
  Lines        6029     6061      +32     
  Branches      965      971       +6     
==========================================
+ Hits         2602     2618      +16     
- Misses       3414     3430      +16     
  Partials       13       13              

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[eantones]

Superseded by #857