feat: DeepSeek API integration + Whale lift (hooks, tool repair, MCP permissions, token tracking)

DeepSeek API:
- @ai-sdk/deepseek provider replaces openai-compatible for deepseek-* models
- Token tracking: cache_hit/reasoning tokens flow API → DB → WS frames → UI
- thinking effort levels (off/low/medium/high/xhigh/max) via AGENTS.md frontmatter
- V4 models: deepseek-v4-flash, deepseek-v4-pro
- Wired for both chat and coder panes

Whale lifts:
- Tool input repair (schema-based type coercion, markdown link unwrapping)
- Hooks system (6 lifecycle events, shell exec, JSON stdin/stdout contract)
- Per-MCP-server permissions (allow/ask/deny)
- token tracking UI (cache N, think N in message stats line)

Infra:
- New DB columns: messages.cache_tokens, messages.reasoning_tokens
- New WS frame fields: cache_tokens, reasoning_tokens on message_complete
- coder provider snapshot merges DeepSeek models alongside llama-swap

apps/web/src/api/types.ts

@@ -152,6 +152,8 @@ export interface Message {
   tokens_used: number | null;
   ctx_used: number | null;
   ctx_max: number | null;
+  cache_tokens: number | null;
+  reasoning_tokens: number | null;
   // model-attribution: which model produced this assistant message (null for
   // user/system rows + pre-attribution messages). Rendered as a chip.
   model: string | null;

apps/web/src/components/MessageBubble.tsx

@@ -156,9 +156,16 @@ function StatsLine({ message }: { message: Message }) {
         : `${ctxUsed} ctx`
       : null;
 
+  const cacheHit = message.cache_tokens;
+  const reasoning = message.reasoning_tokens;
+  const cachePart = typeof cacheHit === 'number' && cacheHit > 0 ? `cache ${cacheHit}` : null;
+  const reasoningPart = typeof reasoning === 'number' && reasoning > 0 ? `think ${reasoning}` : null;
+
   const parts: string[] = [`${tokens} tokens`];
   if (tps !== null) parts.push(`${tps.toFixed(1)} tok/s`);
   if (ctxPart) parts.push(ctxPart);
+  if (cachePart) parts.push(cachePart);
+  if (reasoningPart) parts.push(reasoningPart);
 
   return (
     <div className="text-[10px] font-mono text-muted-foreground">

apps/web/src/hooks/useSessionStream.ts

@@ -123,6 +123,8 @@ function applyFrame(state: State, frame: WsFrame): State {
               ...(frame.tokens_used !== undefined ? { tokens_used: frame.tokens_used } : {}),
               ...(frame.ctx_used !== undefined ? { ctx_used: frame.ctx_used } : {}),
               ...(frame.ctx_max !== undefined ? { ctx_max: frame.ctx_max } : {}),
+              ...(frame.cache_tokens !== undefined ? { cache_tokens: frame.cache_tokens } : {}),
+              ...(frame.reasoning_tokens !== undefined ? { reasoning_tokens: frame.reasoning_tokens } : {}),
               ...(frame.started_at !== undefined ? { started_at: frame.started_at } : {}),
               ...(frame.finished_at !== undefined ? { finished_at: frame.finished_at } : {}),
               ...(frame.model !== undefined ? { model: frame.model } : {}),