feat: add model pattern configuration for ALL providers

This commit extends model pattern configuration to ALL providers,
not just the newly added ones.

**Template changes (ai-gateway.sh):**
All providers now support custom model patterns via environment variables:
- DASHSCOPE_MODELS (default: qwen)
- DEEPSEEK_MODELS (default: deepseek)
- MOONSHOT_MODELS (default: moonshot-.*|kimi-.*)
- ZHIPUAI_MODELS (default: GLM-)
- MINIMAX_MODELS (default: abab)
- AZURE_MODELS (default: gpt-.*|o1-.*|o3-.*)
- OPENAI_MODELS (default: gpt-.*|o1-.*|o3-.*)
- YI_MODELS (default: yi-)
- AI360_MODELS (default: 360GPT)
- BAICHUAN_MODELS (default: Baichuan)
- BAIDU_MODELS (default: ERNIE-)
- CLAUDE_MODELS (default: claude-)
- COHERE_MODELS (default: command|command-.*)
- DOUBAO_MODELS (default: doubao-)
- GEMINI_MODELS (default: gemini-)
- MISTRAL_MODELS (default: open-mistral-.*|mistral-.*)
- OLLAMA_MODELS (default: codellama.*|llama.*)
- STEPFUN_MODELS (default: step-)
- (Plus all previously added providers)

**CLI parameter support:**
Added corresponding --xxx-models parameters for all providers:
--dashscope-models, --deepseek-models, --moonshot-models,
--zhipuai-models, --minimax-models, --azure-models, --openai-models,
--yi-models, --ai360-models, --baichuan-models, --baidu-models,
--claude-models, --cohere-models, --doubao-models, --gemini-models,
--mistral-models, --ollama-models, --stepfun-models

**Interactive configuration functions:**
Added/updated configuration functions for all providers:
- configureDashscopeProvider()
- configureDeepSeekProvider()
- configureMoonshotProvider()
- configureZhipuAIProvider()
- configureOpenAIProvider()
- configureYiProvider()
- configureAI360Provider()
- configureBaichuanProvider()
- configureBaiduProvider()
- configureCohereProvider()
- configureDoubaoProvider()
- configureGeminiProvider()
- configureMistralProvider()
- configureStepfunProvider()

Updated existing functions with model pattern support:
- configureAzureProvider()
- configureMinimaxProvider()
- configureClaudeProvider()
- configureOllamaProvider()

Each function now prompts for model patterns with sensible defaults
matching the template configuration.

**Usage examples:**
```bash
# Customize models for standard providers
./get-ai-gateway.sh start \
  --openai-key="$KEY" --openai-models="gpt-4.*" \
  --dashscope-key="$KEY" --dashscope-models="qwen-.*"

# Mix and match providers by model
./get-ai-gateway.sh start \
  --deepseek-key="$KEY" --deepseek-models="deepseek-coder.*" \
  --moonshot-key="$KEY" --moonshot-models="kimi.*"
```

Now EVERY provider supports custom model pattern configuration,
enabling fine-grained control over model routing.

Author: johnlanni