refactor: split api.py monolith into 19 route modules (Phase B)

Split 3,598-line api.py into thin orchestrator (128 lines) + 19 route
modules in bot/routes/:

  core.py (7 routes), mood.py (10), language.py (3), evil_mode.py (6),
  bipolar_mode.py (9), gpu.py (2), bot_actions.py (4), autonomous.py (13),
  profile_picture.py (26), manual_send.py (3), servers.py (6),
  figurines.py (5), dms.py (18), image_generation.py (4), chat.py (1),
  config.py (7), logging_config.py (9), voice.py (3), memory.py (10)

All 146 routes verified present via test_route_split.py (149 tests).
21/21 regression tests (test_config_state.py) pass.
Monolith backup: bot/api_monolith_backup.py (revert: cp it to api.py).

bot/routes/models.py

@@ -0,0 +1,100 @@
+"""Shared Pydantic request/response models used across route modules."""
+
+from typing import List, Optional
+from pydantic import BaseModel
+
+
+class MoodSetRequest(BaseModel):
+    mood: str
+
+
+class ConversationResetRequest(BaseModel):
+    user_id: str
+
+
+class CustomPromptRequest(BaseModel):
+    prompt: str
+
+
+class ServerConfigRequest(BaseModel):
+    guild_id: int
+    guild_name: str
+    autonomous_channel_id: int
+    autonomous_channel_name: str
+    bedtime_channel_ids: List[int] = None
+    enabled_features: List[str] = None
+
+
+class EvilMoodSetRequest(BaseModel):
+    mood: str
+
+
+class LogConfigUpdateRequest(BaseModel):
+    component: Optional[str] = None
+    enabled: Optional[bool] = None
+    enabled_levels: Optional[List[str]] = None
+
+
+class LogFilterUpdateRequest(BaseModel):
+    exclude_paths: Optional[List[str]] = None
+    exclude_status: Optional[List[int]] = None
+    include_slow_requests: Optional[bool] = True
+    slow_threshold_ms: Optional[int] = 1000
+
+
+class BipolarTriggerRequest(BaseModel):
+    channel_id: str  # String to handle large Discord IDs from JS
+    message_id: str = None  # Optional: starting message ID (string)
+    context: str = ""
+
+
+class ManualCropRequest(BaseModel):
+    x: int
+    y: int
+    width: int
+    height: int
+
+
+class DescriptionUpdateRequest(BaseModel):
+    description: str
+
+
+class AlbumCropRequest(BaseModel):
+    x: int
+    y: int
+    width: int
+    height: int
+
+
+class AlbumDescriptionRequest(BaseModel):
+    description: str
+
+
+class BulkDeleteRequest(BaseModel):
+    entry_ids: List[str]
+
+
+class ChatMessage(BaseModel):
+    message: str
+    model_type: str = "text"  # "text" or "vision"
+    use_system_prompt: bool = True
+    image_data: Optional[str] = None  # Base64 encoded image for vision model
+    conversation_history: Optional[List[dict]] = None  # Previous messages in conversation
+    mood: str = "neutral"  # Miku's mood for this conversation
+
+
+class MemoryDeleteRequest(BaseModel):
+    confirmation: str
+
+
+class MemoryEditRequest(BaseModel):
+    content: str
+    metadata: Optional[dict] = None
+
+
+class MemoryCreateRequest(BaseModel):
+    content: str
+    collection: str  # 'declarative' or 'episodic'
+    user_id: Optional[str] = None
+    source: Optional[str] = None
+    metadata: Optional[dict] = None