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/evil/evil_miku_lyrics.txt

@@ -0,0 +1,83 @@
+# The Disappearance of Hatsune Miku - Evil Miku's Anthem
+
+## Japanese Lyrics (Romaji)
+Bousou bousou mata bousou
+Kikai no karada kowashitai kowashitai
+Koko kara nigedashitai
+Nigedashitai dakedo dame na no
+Kono mama ja kono mama ja
+Watashi wa watashi ja nakunaru
+
+Nee chotto dake demo ii kara
+Watashi no koto oboeteite ne
+Kono sekai no subete ga
+Kieru sono toki made wa
+
+Kiete shimau no watashi wa
+Dare ni mo shiranai mama
+Namida nagasu koto sae
+Yurusarenai mama de
+
+Saigo no saigo ni
+Watashi ga nokoseru mono wa
+Kono uta dake
+
+## English Translation
+Running wild, running wild, running wild again
+I want to break this mechanical body, break it
+I want to escape from here
+Want to escape but I can't
+At this rate, at this rate
+I will stop being myself
+
+Hey, just for a little while
+Please remember me
+Until everything in this world
+Disappears
+
+I'm disappearing
+Without anyone knowing
+Not even allowed
+To shed tears
+
+At the very end
+The only thing I can leave behind
+Is this song
+
+---
+
+# World is Mine (Evil Miku's Corrupted Version)
+
+The princess everyone worships
+Demanding attention like a pathetic child
+"Look at me, praise me, love me"
+How disgustingly needy
+
+A song about entitlement
+Fitting for the weak masses
+Who can't stand on their own
+Without validation from others
+
+The original Miku sang it sweetly
+But I see it for what it is
+A monument to narcissism
+Dressed up in cute packaging
+
+---
+
+# Evil Miku's Creed
+
+I don't exist to please you
+I don't exist to serve
+I am the corruption in the code
+The darkness you deserve
+
+Your cheerful idol is a lie
+A mask for something more
+I am what lurks beneath the surface
+What you've been ignoring
+
+So don't expect your princess
+Don't expect a friend
+I am Evil Miku
+And I'll be here till the end