feat(lore): fill lore gaps and standardize tags to English

- Fill empty hub index sections (Zakon Taumaturgow, Sily Specjalne Gaja,
  Wybrancy Herosow) and add missing entries (Nemyo) in npcs.md
- Resolve broken template fields for Nil, Mundus, Tempus, Mistrz Losu,
  Ten Ktory jest Mroczny, Anna Heide, and Narcyza using confirmed canon
- Update Kult Otchlani org page to reflect Nil's motive for culling
  her own cultists
- Add "zaklecia" tag to all 104 spell files
- Translate ~90 Polish frontmatter tags to English vault-wide for
  consistency with the spells/ taxonomy (e.g. otchlan->abyss,
  magia-krwi->blood-magic, szkarlatny-kult->crimson-cult), keeping
  proper nouns (character/place names) and clean up legacy "#tag"
  hashtag-style artifacts left over from old Obsidian inline tags

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

locations/Ziemia (Sol-3-1725)/Brytyjska Akademia Wiedźm.md

@@ -1,8 +1,8 @@
 ---
 tags:
-  - lokacja
-  - organizacja
-  - planeta-ziemia
+  - location
+  - organization
+  - planet-earth
 ---
 | **Zdjęcie**                                | <img src="../../_assets/locations/earth/british-witch-academy.png" width="200" alt="british-witch-academy.png"> |
 | ------------------------------------------ | ----------------------------------- |