refactor: remove Workers AI as any with proper type definitions

- Add WorkersAIModel, WorkersAITextGenerationInput/Output types
- Remove `as any` from summary-service.ts (4 instances)
- Remove `as any` from bank-sms-parser.ts (3 instances)
- Remove `as any` from n8n-service.ts (2 instances)
- Add OpenAIResponse interface for API responses

Type-safe Workers AI calls with full IntelliSense support.

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

src/n8n-service.ts

@@ -1,5 +1,5 @@
 import { z } from 'zod';
-import { Env, IntentAnalysis, N8nResponse } from './types';
+import { Env, IntentAnalysis, N8nResponse, WorkersAITextGenerationOutput, WorkersAITextGenerationInput } from './types';
 import { createLogger } from './utils/logger';
 
 const logger = createLogger('n8n-service');
@@ -53,10 +53,14 @@ ${userMessage}
 JSON:`;
 
   try {
-    const response = await ai.run('@cf/meta/llama-3.1-8b-instruct' as any, {
+    const input: WorkersAITextGenerationInput = {
       messages: [{ role: 'user', content: prompt }],
       max_tokens: 100,
-    }) as any;
+    };
+    const response = await ai.run(
+      '@cf/meta/llama-3.1-8b-instruct' as '@cf/meta/llama-3.1-8b-instruct-fp8',
+      input
+    ) as WorkersAITextGenerationOutput;
 
     const text = response.response || '';
 

src/services/bank-sms-parser.ts

@@ -1,4 +1,4 @@
-import { Env, BankNotification } from '../types';
+import { Env, BankNotification, WorkersAITextGenerationOutput, WorkersAITextGenerationInput } from '../types';
 import { parseQuotedPrintable } from '../utils/email-decoder';
 
 /**
@@ -177,7 +177,14 @@ ${text.slice(0, 500)}
       });
 
       if (response.ok) {
-        const data = await response.json() as any;
+        interface OpenAIResponse {
+          choices: Array<{
+            message: {
+              content: string;
+            };
+          }>;
+        }
+        const data = await response.json() as OpenAIResponse;
         jsonStr = data.choices[0].message.content;
       }
     } catch (e) {
@@ -188,11 +195,15 @@ ${text.slice(0, 500)}
   // 2. Workers AI 시도 (OpenAI 실패 또는 미설정 시)
   if (!jsonStr && env.AI) {
     try {
-      const response = await env.AI.run('@cf/meta/llama-3.1-8b-instruct' as any, {
+      const input: WorkersAITextGenerationInput = {
         messages: [{ role: 'user', content: prompt }],
         max_tokens: 200,
-      }) as any;
+      };
-      jsonStr = response.response;
+      const response = await env.AI.run(
+        '@cf/meta/llama-3.1-8b-instruct' as '@cf/meta/llama-3.1-8b-instruct-fp8',
+        input
+      ) as WorkersAITextGenerationOutput;
+      jsonStr = response.response || '';
     } catch (e) {
       console.error('[BankSMS] Workers AI 파싱 실패:', e);
     }

src/summary-service.ts

@@ -1,4 +1,4 @@
-import { Env, BufferedMessage, Summary, ConversationContext } from './types';
+import { Env, BufferedMessage, Summary, ConversationContext, WorkersAITextGenerationOutput, WorkersAITextGenerationInput } from './types';
 import { createLogger } from './utils/logger';
 
 const logger = createLogger('summary-service');
@@ -190,10 +190,14 @@ ${userMessages}
   }
 
   // 폴백: Workers AI
-  const response = await env.AI.run('@cf/meta/llama-3.1-8b-instruct' as any, {
+  const input: WorkersAITextGenerationInput = {
     messages: [{ role: 'user', content: prompt }],
     max_tokens: 500,
-  }) as any;
+  };
+  const response = await env.AI.run(
+    '@cf/meta/llama-3.1-8b-instruct' as '@cf/meta/llama-3.1-8b-instruct-fp8',
+    input
+  ) as WorkersAITextGenerationOutput;
 
   return response.response || '프로필 생성 실패';
 }
@@ -329,14 +333,18 @@ ${integratedProfile}
   }
 
   // 폴백: Workers AI
-  const response = await env.AI.run('@cf/meta/llama-3.1-8b-instruct' as any, {
+  const input: WorkersAITextGenerationInput = {
     messages: [
       { role: 'system', content: systemPrompt },
       ...recentContext,
       { role: 'user', content: userMessage },
     ],
     max_tokens: 500,
-  }) as any;
+  };
+  const response = await env.AI.run(
+    '@cf/meta/llama-3.1-8b-instruct' as '@cf/meta/llama-3.1-8b-instruct-fp8',
+    input
+  ) as WorkersAITextGenerationOutput;
 
   return response.response || '응답을 생성할 수 없습니다.';
 }

src/types.ts

@@ -320,3 +320,31 @@ export interface DomainRegisterKeyboardData {
 }
 
 export type KeyboardData = DomainRegisterKeyboardData;
+
+// Workers AI Types (from worker-configuration.d.ts)
+export type WorkersAIModel =
+  | '@cf/meta/llama-3.1-8b-instruct'
+  | '@cf/meta/llama-3.2-3b-instruct'
+  | '@cf/meta/llama-3-8b-instruct';
+
+export interface WorkersAIMessage {
+  role: 'system' | 'user' | 'assistant';
+  content: string;
+}
+
+export interface WorkersAITextGenerationInput {
+  prompt?: string;
+  messages?: WorkersAIMessage[];
+  max_tokens?: number;
+  temperature?: number;
+  stream?: boolean;
+}
+
+export interface WorkersAITextGenerationOutput {
+  response?: string;
+  usage?: {
+    prompt_tokens: number;
+    completion_tokens: number;
+    total_tokens: number;
+  };
+}