Move all OCA HR modules from oca-technical to dedicated oca-hr submodule

Reorganized 67 HR-related modules for better structure:
- Moved all odoo-bringout-oca-hr-* packages from packages/oca-technical/
- Now organized in dedicated packages/oca-hr/ submodule
- Includes attendance, expense, holiday, employee, and contract modules
- Maintains all module functionality while improving project organization

This creates a cleaner separation between general technical modules
and HR-specific functionality.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

odoo-bringout-oca-hr-hr_contract_reference/hr_contract_reference/readme/CONFIGURE.rst

@@ -0,0 +1,4 @@
+If you want to modify the format of the sequence, go to
+Settings -> Technical -> Sequences & Identifiers -> Sequences
+and search for the "Contract Reference" sequence, where you modify
+its prefix and numbering formats.

odoo-bringout-oca-hr-hr_contract_reference/hr_contract_reference/readme/CONTRIBUTORS.rst

@@ -0,0 +1,5 @@
+* Michael Telahun Makonnen <mmakonnen@gmail.com>
+* Fekete Mihai <feketemihai@gmail.com>
+* Denis Leemann <denis.leemann@camptocamp.com>
+* Serpent Consulting Services Pvt. Ltd. <support@serpentcs.com>
+* Nikul Chaudhary <nikulchaudhary2112@gmail.com>

odoo-bringout-oca-hr-hr_contract_reference/hr_contract_reference/readme/DESCRIPTION.rst

@@ -0,0 +1,3 @@
+This module was written to extend the functionality of employees contracts
+to support sequence of contract reference which will be generated
+automatically from the sequence predefined.

odoo-bringout-oca-hr-hr_contract_reference/hr_contract_reference/readme/USAGE.rst

@@ -0,0 +1,2 @@
+When you will create a new employee contract, the field reference will be
+assigned automatically with the next number of the predefined sequence.