fix: align terraform resources with actual provider schema

Use nested attribute assignment instead of dynamic blocks for
specifications, quality_groups, and format_items. Remove unsupported
season_search_maximum_single_episode_age from indexer configs. Flatten
custom format specifications to use value/min/max directly.

config/custom_format/resolution_1080p.yaml

@@ -1,9 +1,7 @@
 include_custom_format_when_renaming: false
 specifications:
-  - name: 1080p
-    implementation: ResolutionSpecification
-    negate: false
-    required: false
-    fields:
-      - name: value
-        value: "1080"
+- name: 1080p
+  implementation: ResolutionSpecification
+  negate: false
+  required: false
+  value: '1080'