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/models/__init__.py

@@ -0,0 +1,3 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import hr_contract

odoo-bringout-oca-hr-hr_contract_reference/hr_contract_reference/models/hr_contract.py

@@ -0,0 +1,19 @@
+# copyright 2011,2013 Michael Telahun Makonnen <mmakonnen@gmail.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, fields, models
+
+
+class HrContract(models.Model):
+    _inherit = "hr.contract"
+
+    name = fields.Char(
+        "Contract Reference", required=False, readonly=True, copy=False, default="/"
+    )
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            if vals.get("name", "/") == "/":
+                vals["name"] = self.env["ir.sequence"].next_by_code("contract.ref")
+        return super().create(vals_list)