fix(rules): condition durations scale with caster level (hold person, doom, touch of fatigue, vanish)

ConditionEffect gains duration_rounds_per_level and max_duration_rounds
(mirroring PenaltyEffect), applied as caster_level * per_level rounds capped
at max: hold person 1 rd/lvl, doom 1 min/lvl, touch of fatigue 1 rd/lvl,
vanish 1 rd/lvl (max 5). Extend Spell doubles both the per-level rate and
the cap. Tests cover scaling and the vanish cap.

data/spells/doom.json

@@ -11,8 +11,9 @@
       "type": "condition",
       "condition_name": "shaken",
       "duration_rounds": 10,
+      "duration_rounds_per_level": 10,
       "save_negates": true
     }
   ],
-  "description": "SRD spells/doom.md: the subject is filled with horrible dread and becomes shaken (-2 on attacks and saves). Saving Throw Will negates - there is no partial success (the earlier '-1 on a successful save' wording was a D&D 3.5 rule that does not exist in PF1e). Duration 1 min/level approximated as 10 rounds."
+  "description": "SRD spells/doom.md: the subject is filled with horrible dread and becomes shaken (-2 on attacks and saves). Saving Throw Will negates - there is no partial success (the earlier '-1 on a successful save' wording was a D&D 3.5 rule that does not exist in PF1e). Duration 1 min/level (10 rounds per level)."
 }

data/spells/hold_person.json

@@ -10,9 +10,10 @@
     {
       "type": "condition",
       "condition_name": "paralyzed",
-      "duration_rounds": 3,
+      "duration_rounds": 1,
+      "duration_rounds_per_level": 1,
       "save_negates": true
     }
   ],
-  "description": "The subject becomes paralyzed and freezes in place. Will negates."
+  "description": "The subject becomes paralyzed and freezes in place. Will negates. Duration 1 round/level."
 }

data/spells/touch_of_fatigue.json

@@ -10,9 +10,10 @@
     {
       "type": "condition",
       "condition_name": "fatigued",
-      "duration_rounds": 4,
+      "duration_rounds": 1,
+      "duration_rounds_per_level": 1,
       "save_negates": true
     }
   ],
-  "description": "A cantrip: a melee touch attack channels negative energy, making the target fatigued for 1 round/level (modeled as 4 rounds at caster level 4; the effect ends with the duration rather than by long rest). No effect on an already fatigued creature or on creatures immune to fatigue. Fortitude negates."
+  "description": "A cantrip: a melee touch attack channels negative energy, making the target fatigued for 1 round/level (the effect ends with the duration rather than by long rest). No effect on an already fatigued creature or on creatures immune to fatigue. Fortitude negates."
 }

data/spells/vanish.json

@@ -10,7 +10,9 @@
     {
       "type": "condition",
       "condition_name": "invisible",
-      "duration_rounds": 5,
+      "duration_rounds": 1,
+      "duration_rounds_per_level": 1,
+      "max_duration_rounds": 5,
       "save_negates": false
     }
   ],