Rework balances around per-parent days left and deduce the partner from FK

Manual entry now takes one parent's sjukpenningnivå, lägstanivå and
dubbeldagar left (plus optional reserved days) and derives the rest in
build_snapshot, shared with the scraper. The scraper also reads the
family panel and exposes a partner deduction; with two parents it is
saved as a 'deduced' snapshot (migration 002). Parent count is the single
source of entitlement: one member gets 480 days and 96 savable at age 4,
two get 240 and 48 each. Workspaces are capped at two parents.

Also lands the in-flight squash of migrations 002–011 into the initial
schema and the removal of planning_mode.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/app/config.py

@@ -81,10 +81,11 @@ class LeaveRules(BaseModel):
 
     @property
     def max_savable_days_per_parent_at_age_4(self) -> int:
-        """Age-4 ceiling — per PARENT. `max_savable_days_at_age_4` (96) is a
-        per-child pool; when a child has two parents, each parent's own
-        savable balance is capped at half of that (48), not 96 each (which
-        would let a two-parent family save 192 combined).
+        """Age-4 ceiling — per PARENT, non-poolable. `max_savable_days_at_age_4`
+        (96) is a per-child pool; as soon as a child has two parents, each
+        parent's own savable balance is capped at half of that (48), not 96
+        each (which would let a two-parent family save 192 combined). This
+        applies purely based on how many parents the child has.
         `app.utils.tip_predicates.resolve_age4_savable_cap` is the single
         place that decides which of the two applies.
         """
@@ -132,6 +133,13 @@ class Settings(BaseSettings):
     # a deliberate opt-in for local debugging only, never for production.
     scraper_debug_dir: str | None = None
     scraper_debug_enabled: bool = False
+    # Also dump debug artifacts (HTML + full-page screenshot) after a
+    # *successful* extraction, not just on error — a capture aid for
+    # confirming FK's real DOM (e.g. the family panel structure assumed by
+    # `app.scrapers.fk_scraper._SEL.FAMILY*`). Same personal-data warning as
+    # above applies; only takes effect when both `scraper_debug_enabled` and
+    # `scraper_debug_dir` are also set.
+    scraper_debug_dump_on_success: bool = False
     # How long a terminal (done/error/cancelled) session's QR/result stays in
     # RAM before `_ttl_watchdog`/`poll` purge it from `_sessions`.
     scraper_result_retention_seconds: int = 300