refactor(models): migrate to granular model configuration architecture

Upgrade Claude model configuration from dual-key to quad-key system for
better model tier differentiation.

**Breaking Changes:**
- Replace `ANTHROPIC_SMALL_FAST_MODEL` with three granular keys:
  - `ANTHROPIC_DEFAULT_HAIKU_MODEL`
  - `ANTHROPIC_DEFAULT_SONNET_MODEL`
  - `ANTHROPIC_DEFAULT_OPUS_MODEL`

**Backend (Rust):**
- Add `normalize_claude_models_in_value()` for automatic migration
- Implement fallback chain: `DEFAULT_* || SMALL_FAST || MODEL`
- Auto-cleanup: remove legacy `SMALL_FAST` key after normalization
- Apply normalization across 6 critical paths:
  - Add/update provider
  - Read from live config
  - Write to live config
  - Refresh config snapshot

**Frontend (React):**
- Expand UI from 2 to 4 model input fields
- Implement smart fallback in `useModelState` hook
- Update `useKimiModelSelector` for Kimi model picker
- Add i18n keys for Haiku/Sonnet/Opus labels (zh/en)

**Configuration:**
- Update all 7 provider presets to new format
- DeepSeek/Qwen/Moonshot: use same model for all tiers
- Zhipu: preserve tier differentiation (glm-4.5-air for Haiku)

**Backward Compatibility:**
- Old configs auto-upgrade on first read/write
- Fallback chain ensures graceful degradation
- No manual migration required

Closes #[issue-number]

src/config/providerPresets.ts

@@ -61,7 +61,9 @@ export const providerPresets: ProviderPreset[] = [
         ANTHROPIC_BASE_URL: "https://api.deepseek.com/anthropic",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "DeepSeek-V3.2-Exp",
-        ANTHROPIC_SMALL_FAST_MODEL: "DeepSeek-V3.2-Exp",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "DeepSeek-V3.2-Exp",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "DeepSeek-V3.2-Exp",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "DeepSeek-V3.2-Exp",
       },
     },
     category: "cn_official",
@@ -75,7 +77,6 @@ export const providerPresets: ProviderPreset[] = [
         ANTHROPIC_AUTH_TOKEN: "",
         // 兼容旧键名，保持前端读取一致
         ANTHROPIC_MODEL: "GLM-4.6",
-        ANTHROPIC_SMALL_FAST_MODEL: "glm-4.5-air",
         ANTHROPIC_DEFAULT_HAIKU_MODEL: "glm-4.5-air",
         ANTHROPIC_DEFAULT_SONNET_MODEL: "glm-4.6",
         ANTHROPIC_DEFAULT_OPUS_MODEL: "glm-4.6",
@@ -92,7 +93,9 @@ export const providerPresets: ProviderPreset[] = [
           "https://dashscope.aliyuncs.com/api/v2/apps/claude-code-proxy",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "qwen3-max",
-        ANTHROPIC_SMALL_FAST_MODEL: "qwen3-max",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "qwen3-max",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "qwen3-max",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "qwen3-max",
       },
     },
     category: "cn_official",
@@ -105,7 +108,9 @@ export const providerPresets: ProviderPreset[] = [
         ANTHROPIC_BASE_URL: "https://api.moonshot.cn/anthropic",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "kimi-k2-turbo-preview",
-        ANTHROPIC_SMALL_FAST_MODEL: "kimi-k2-turbo-preview",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "kimi-k2-turbo-preview",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "kimi-k2-turbo-preview",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "kimi-k2-turbo-preview",
       },
     },
     category: "cn_official",
@@ -118,7 +123,9 @@ export const providerPresets: ProviderPreset[] = [
         ANTHROPIC_BASE_URL: "https://api-inference.modelscope.cn",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "ZhipuAI/GLM-4.6",
-        ANTHROPIC_SMALL_FAST_MODEL: "ZhipuAI/GLM-4.6",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "ZhipuAI/GLM-4.6",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "ZhipuAI/GLM-4.6",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "ZhipuAI/GLM-4.6",
       },
     },
     category: "aggregator",
@@ -133,7 +140,9 @@ export const providerPresets: ProviderPreset[] = [
           "https://vanchin.streamlake.ai/api/gateway/v1/endpoints/${ENDPOINT_ID}/claude-code-proxy",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "KAT-Coder",
-        ANTHROPIC_SMALL_FAST_MODEL: "KAT-Coder",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "KAT-Coder",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "KAT-Coder",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "KAT-Coder",
       },
     },
     category: "cn_official",
@@ -155,7 +164,7 @@ export const providerPresets: ProviderPreset[] = [
         ANTHROPIC_BASE_URL: "https://api.longcat.chat/anthropic",
         ANTHROPIC_AUTH_TOKEN: "",
         ANTHROPIC_MODEL: "LongCat-Flash-Chat",
-        ANTHROPIC_SMALL_FAST_MODEL: "LongCat-Flash-Chat",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "LongCat-Flash-Chat",
         ANTHROPIC_DEFAULT_SONNET_MODEL: "LongCat-Flash-Chat",
         ANTHROPIC_DEFAULT_OPUS_MODEL: "LongCat-Flash-Chat",
         CLAUDE_CODE_MAX_OUTPUT_TOKENS: "6000",