chore: codebase audit — remove dead code, unused deps, clean configs

Phase 1: Delete 19 dead component/service/tool files (4,200+ lines)
Phase 2: Remove 13 unused npm packages (Radix UI, shadcn utilities, ytdl-core, etc.)
Phase 3: Database schema — drop agent_delegations, add performance indexes
Phase 4: Remove 12 dead types from database.ts/analytics.ts/helpers.ts
Phase 5: Strip shadcn/ui theme from tailwind config
Phase 6: Clean env vars, fix broken imports (LocalKeyGate, MapViewer)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/types/analytics.ts

@@ -23,92 +23,6 @@ export interface UsageData {
   mode?: 'easy' | 'hard';
 }
 
-export interface EnhancedChatMetadata {
-  timestamp: string;
-  session_id: string;
-  current_view: 'nodes' | 'memory';
-  open_tab_count: number;
-  has_focused_node: boolean;
-  message_count: number;
-  input_tokens?: number;
-  output_tokens?: number;
-  total_tokens?: number;
-  cache_write_tokens?: number;
-  cache_read_tokens?: number;
-  cache_hit?: boolean;
-  cache_savings_pct?: number;
-  estimated_cost_usd?: number;
-  model_used?: string;
-  provider?: 'anthropic' | 'openai';
-  tools_used?: string[];
-  tool_calls_count?: number;
-  trace_id?: string;
-  parent_chat_id?: number;
-  voice_tts_chars?: number;
-  voice_tts_cost_usd?: number;
-  voice_tts_chars_total?: number;
-  voice_tts_cost_usd_total?: number;
-  voice_request_id?: string;
-  voice_tts_request_count?: number;
-  voice_usage?: Array<{
-    request_id: string;
-    message_id?: string | null;
-    chars: number;
-    cost_usd: number;
-    voice?: string;
-    model?: string;
-    duration_ms?: number | null;
-    logged_at?: string;
-  }>;
-}
-
-export interface CostReport {
-  periodStart: string;
-  periodEnd: string;
-  totalCostUsd: number;
-  totalChats: number;
-  totalTokens: number;
-  inputTokens: number;
-  outputTokens: number;
-  cacheReadTokens: number;
-  cacheWriteTokens: number;
-  cacheHitRate: number;
-  cacheSavingsUsd: number;
-  avgCostPerChat: number;
-  avgTokensPerChat: number;
-  costByAgent: {
-    [agentName: string]: {
-      costUsd: number;
-      chats: number;
-      tokens: number;
-    };
-  };
-  costByModel: {
-    [modelId: string]: {
-      costUsd: number;
-      chats: number;
-      tokens: number;
-    };
-  };
-}
-
-export interface TraceCostSummary {
-  traceId: string;
-  totalCostUsd: number;
-  chatCount: number;
-  orchestratorCost: number;
-  executorCost: number;
-  plannerCost: number;
-  totalTokens: number;
-  interactions: Array<{
-    chatId: number;
-    agentName: string;
-    costUsd: number;
-    tokens: number;
-    createdAt: string;
-  }>;
-}
-
 export interface ModelPricing {
   provider: 'anthropic' | 'openai';
   inputPer1M: number;
@@ -117,12 +31,3 @@ export interface ModelPricing {
   cacheReadPer1M?: number;
 }
 
-export interface CacheEffectiveness {
-  totalRequests: number;
-  cacheHits: number;
-  cacheMisses: number;
-  hitRate: number;
-  totalCacheSavingsUsd: number;
-  avgSavingsPerHit: number;
-  totalTokensSaved: number;
-}