refactor: deduplicate prompts, reorganize persona files, update paths

Prompt deduplication (~20% reduction, 4,743 chars saved):
- evil_miku_lore.txt: remove intra-file duplication (height rule 2x,
  cruelty-has-substance 2x, music secret 2x, adoration secret 2x),
  trim verbose restatements, cut speech examples from 10 to 6
- evil_miku_prompt.txt: remove entire PERSONALITY section (in lore),
  remove entire RESPONSE STYLE section (now only in preamble),
  soften height from prohibition to knowledge
- miku_lore.txt: remove RELATIONSHIPS section (duplicates FRIENDS)
- miku_prompt.txt: remove duplicate intro, 4 personality traits
  already in lore, FAMOUS SONGS section (in lore), fix response
  length inconsistency (1-2 vs 2-3 -> consistent 2-3)

Preamble updates (evil_mode.py, evil_miku_personality.py, llm.py,
miku_personality.py):
- Response rules now exist in ONE place only (preamble)
- Height rule softened: model knows 15.8m, can say it if asked,
  but won't default to quoting it when taunting
- Response length: 2-4 sentences (was 1-3), removed action template
  list that model was copying literally (*scoffs*, *rolls eyes*)
- Added: always include actual words, never action-only responses
- Normal Miku: trim CHARACTER CONTEXT, fix 1-3 -> 2-3 sentences

Directory reorganization:
- Move 6 persona files to bot/persona/{evil,miku}/ subdirectories
- Update all open() paths in evil_mode.py, context_manager.py,
  voice_manager.py, both Cat plugins
- Dockerfile: 6 COPY lines -> 1 (COPY persona /app/persona)
- docker-compose: 6 file mounts -> 2 directory mounts
  (bot/persona/evil -> cat/data/evil, bot/persona/miku -> cat/data/miku)

Evil Miku system (previously unstaged):
- Full evil mood management: 2h rotation timer, mood persistence,
  10 mood-specific autonomous template pools, mood-aware DMs
- Evil mode toggle with role color/nickname/pfp management
- get_evil_system_prompt() with mood integration

Add test_evil_moods.py: 10-mood x 3-message comprehensive test

bot/persona/miku/miku_lyrics.txt

@@ -0,0 +1,66 @@
+# World is Mine - Hatsune Miku
+
+## Japanese Lyrics (Romaji)
+Sekai de ichiban ohimesama
+Sou iu atsukai kokoro ete yo ne?
+
+Sono ichi, itsumo to chigau kamigata ni kigatsuku koto
+Sono ni, chanto kutsu made mirukoto, ii ne?
+Sono san, watashi no hitogoto niwa mittsu no kotoba de henji suru koto
+Wakattara migite ga orusu nanowo nantoka shite!
+
+Betsu ni wagamama nante itte nain dakara
+Kimi ni kokoro kara omotte hoshii no kawaii tte
+
+Sekai de ichiban ohimesama
+Ki ga tsuite, nee nee
+Mataseru nante rongai yo
+Watashi wo dare dato omotteru no?
+Mou nanda ka amai mono ga tabetai!
+Ima sugu ni yo
+
+Oh, check one two
+Ahh!
+
+Ketten? Kawaii no machigai desho
+Monku wa yurushimasen no
+Ano ne? Watashi no hanashi chanto kiiteru? Chotto
+A, sore to ne? Shiroi ouma san kimatteru desho?
+Mukae ni kite
+Wakattara kashizuite te wo tottе "ohimesama" tte
+See upcoming pop shows
+Get tickets for your favorite artists
+You might also like
+So Long, London
+Taylor Swift
+Say Don’t Go (Taylor’s Version) [From The Vault]
+Taylor Swift
+THE HEART PART 6
+Drake
+Betsu ni wagamama nantе itte nain dakara
+Demo ne sukoshi kurai shikatte kuretatte iino yo?
+
+Sekai de watashi dake no oujisama
+Chisa tsuite, hora hora
+Otete ga aitemasu
+Mukuchi de buaiso na oujisama
+Mou, doushite? ki ga tsuite yo hayaku
+Zettai kimi wa wakatte nai!
+Wakatte nai wa
+
+Ichigo no notta shootokeeki
+Kodawari tamago no torokeru purrin
+Minna, minna gaman shimasu
+Wagamama na ko dato omowanai de
+Watashi datte yareba dekiru no
+Ato de koukai suru wayo
+
+^DERE TIME END^
+
+Touzen desu! datte watashi wa
+Sekai de ichiban ohimesama
+Chanto mitete yone dokoka ni icchau yo?
+Fui ni dakishimerareta kyuuni sonna e?
+"Hikareru abunai yo" sou itte soppo muku kimi
+Kocchi noga abunaiwa yo
+Oh, hey baby