Make module installable on stock Odoo 18 (verified via test DB install)

Caught and fixed by running an actual install on a throwaway DB:

- Strip 29 # comment lines from ir.model.access.csv (Odoo CSV loader treats
  them as malformed rows → IndexError); 79 data rows preserved
- Remove obsolete ir.cron.numbercall field (removed in Odoo 17+) from 4 cron
  records in fl_deadline_rules.xml
- Rename <tree>→<list> across 26 sites; inside x2many inline views Odoo 18 no
  longer recognizes <tree>, which made it fall back to the outer model and
  reject inner fields ("Field 'partner_id' does not exist in model 'fl.case'")
- Add store=True to non-stored computed fields referenced by search filters,
  which Odoo 18 now rejects as unsearchable:
  - fl.case: overdue_deadline_count, next_deadline_label
  - fl.deposition: notice_valid

Module loads cleanly: 31 fl.* models registered, no errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

activeblue_familylaw/views/fl_party_views.xml

@@ -45,13 +45,13 @@
                                 </group>
                                 <separator string="Income Sources"/>
                                 <field name="income_source_ids">
-                                    <tree editable="bottom">
+                                    <list editable="bottom">
                                         <field name="source_type"/>
                                         <field name="description"/>
                                         <field name="monthly_amount"/>
                                         <field name="verified"/>
                                         <field name="verification_document"/>
-                                    </tree>
+                                    </list>
                                 </field>
                             </page>
                             <page string="Income Imputation (FL 61.30(2)(b))">
@@ -109,7 +109,7 @@
             <field name="name">fl.party.tree</field>
             <field name="model">fl.party</field>
             <field name="arch" type="xml">
-                <tree string="Parties">
+                <list string="Parties">
                     <field name="case_id"/>
                     <field name="partner_id"/>
                     <field name="role"/>
@@ -118,7 +118,7 @@
                     <field name="net_monthly_income"/>
                     <field name="income_imputed"/>
                     <field name="lifestyle_inconsistency_flag" string="Lifestyle ⚠"/>
-                </tree>
+                </list>
             </field>
         </record>