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/models/fl_case.py

@@ -353,11 +353,11 @@ class FlCase(models.Model):
     )
     next_deadline_label = fields.Char(
         string='Next Deadline Description',
-        compute='_compute_next_deadline'
+        compute='_compute_next_deadline', store=True
     )
     overdue_deadline_count = fields.Integer(
         string='Overdue Deadlines',
-        compute='_compute_next_deadline'
+        compute='_compute_next_deadline', store=True
     )
 
     # ══════════════════════════════════════════════════════════════════════

activeblue_familylaw/models/fl_deposition.py

@@ -49,7 +49,7 @@ class FlDeposition(models.Model):
     )
     notice_valid = fields.Boolean(
         string='Notice Valid (≥10 days)',
-        compute='_compute_notice_info',
+        compute='_compute_notice_info', store=True,
         help='FL 1.310(b): At least 10 days notice required'
     )
     notice_warning = fields.Char(