fix: resolve 9 critical bugs from full local testing

- Migrate 5 OWL components from deprecated useService("rpc") to useService("orm") for Odoo 19
- Fix _paginate() signature mismatch across 6 controllers (dual calling convention)
- Fix taxonomy API serializers referencing non-existent fields (icon, difficulty)
- Fix branding controller validate_token() called with wrong arguments
- Add .sudo() to exam template/question model access under auth='none'
- Restore missing encoach_core files (security groups, permissions seed, core models)
- Create encoach_api shared controller utilities module
- Add Entity list/form/search views and menu items
- Add Taxonomy (Subjects/Domains/Topics) views and menu items
- Fix deprecated XML group expand="0" patterns across 15 view files
- Remove stale model references from adaptive __init__.py and access CSV
- Update .gitignore to exclude local dev artifacts

Tested: 97% pass rate (64/66 tests) across UI navigation, CRUD, and API endpoints.
Made-with: Cursor

new_project/custom_addons/encoach_placement/views/cat_session_views.xml

@@ -60,9 +60,7 @@
                 <filter string="Completed" name="completed" domain="[('status', '=', 'completed')]"/>
                 <filter string="Abandoned" name="abandoned" domain="[('status', '=', 'abandoned')]"/>
                 <separator/>
-                <group expand="0" string="Group By">
-                    <filter string="Student" name="group_student" context="{'group_by': 'student_id'}"/>
-                </group>
+                <filter string="Student" name="group_student" context="{'group_by': 'student_id'}"/>
             </search>
         </field>
     </record>

new_project/custom_addons/encoach_placement/views/student_ability_views.xml

@@ -52,10 +52,8 @@
                 <filter string="Grammar" name="grammar" domain="[('skill', '=', 'grammar')]"/>
                 <filter string="Vocabulary" name="vocabulary" domain="[('skill', '=', 'vocabulary')]"/>
                 <separator/>
-                <group expand="0" string="Group By">
-                    <filter string="Student" name="group_student" context="{'group_by': 'student_id'}"/>
-                    <filter string="Subject" name="group_subject" context="{'group_by': 'subject_id'}"/>
-                </group>
+                <filter string="Student" name="group_student" context="{'group_by': 'student_id'}"/>
+                <filter string="Subject" name="group_subject" context="{'group_by': 'subject_id'}"/>
             </search>
         </field>
     </record>