docs(conversation): reference env vars for default models in conversation components

Signed-off-by: Erin La <107987318+giterinhub@users.noreply.github.com>

Author: giterinhub

daprdocs/content/en/reference/components-reference/supported-conversation/anthropic.md

@@ -20,7 +20,7 @@ spec:
   - name: key
     value: "mykey"
   - name: model
-    value: claude-3-5-sonnet-20240620
+  value: '${{DAPR_CONVERSATION_ANTHROPIC_MODEL}}'
   - name: cacheTTL
     value: 10m
 ```
@@ -34,7 +34,7 @@ The above example uses secrets as plain strings. It is recommended to use a secr
 | Field              | Required | Details | Example |
 |--------------------|:--------:|---------|---------|
 | `key`   | Y | API key for Anthropic. | `"mykey"` |
-| `model` | N | The Anthropic LLM to use. Defaults to `claude-3-5-sonnet-20240620`  | `claude-3-5-sonnet-20240620` |
+| `model` | N | The Anthropic LLM to use. Defaults to `claude-3-5-sonnet-20240620` (configurable via `DAPR_CONVERSATION_ANTHROPIC_MODEL` environment variable).  | `${{DAPR_CONVERSATION_ANTHROPIC_MODEL}}` |
 | `cacheTTL` | N | A time-to-live value for a prompt cache to expire. Uses Golang duration format.  | `10m` |
 
 ## Related links

daprdocs/content/en/reference/components-reference/supported-conversation/hugging-face.md

@@ -20,7 +20,7 @@ spec:
   - name: key
     value: mykey
   - name: model
-    value: meta-llama/Meta-Llama-3-8B
+  value: '${{DAPR_CONVERSATION_HUGGINGFACE_MODEL}}'
   - name: cacheTTL
     value: 10m
 ```
@@ -34,7 +34,7 @@ The above example uses secrets as plain strings. It is recommended to use a secr
 | Field              | Required | Details | Example |
 |--------------------|:--------:|---------|---------|
 | `key`   | Y | API key for Huggingface. | `mykey` |
-| `model` | N | The Huggingface LLM to use. Defaults to `meta-llama/Meta-Llama-3-8B`.  | `meta-llama/Meta-Llama-3-8B` |
+| `model` | N | The Huggingface LLM to use. Defaults to `deepseek-ai/DeepSeek-R1-Distill-Qwen-32B` (configurable via `DAPR_CONVERSATION_HUGGINGFACE_MODEL` environment variable).  | `${{DAPR_CONVERSATION_HUGGINGFACE_MODEL}}` |
 | `cacheTTL` | N | A time-to-live value for a prompt cache to expire. Uses Golang duration format.  | `10m` |
 
 ## Related links

daprdocs/content/en/reference/components-reference/supported-conversation/mistral.md

@@ -20,7 +20,7 @@ spec:
   - name: key
     value: mykey
   - name: model
-    value: open-mistral-7b
+  value: '${{DAPR_CONVERSATION_MISTRAL_MODEL}}'
   - name: cacheTTL
     value: 10m
 ```
@@ -34,7 +34,7 @@ The above example uses secrets as plain strings. It is recommended to use a secr
 | Field              | Required | Details | Example |
 |--------------------|:--------:|---------|---------|
 | `key`   | Y | API key for Mistral. | `mykey` |
-| `model` | N | The Mistral LLM to use. Defaults to `open-mistral-7b`.  | `open-mistral-7b` |
+| `model` | N | The Mistral LLM to use. Defaults to `open-mistral-7b` (configurable via `DAPR_CONVERSATION_MISTRAL_MODEL` environment variable).  | `${{DAPR_CONVERSATION_MISTRAL_MODEL}}` |
 | `cacheTTL` | N | A time-to-live value for a prompt cache to expire. Uses Golang duration format.  | `10m` |
 
 ## Related links

daprdocs/content/en/reference/components-reference/supported-conversation/openai.md

@@ -20,7 +20,7 @@ spec:
   - name: key
     value: mykey
   - name: model
-    value: gpt-4-turbo
+  value: '${{DAPR_CONVERSATION_OPENAI_MODEL}}'
   - name: cacheTTL
     value: 10m
 ```
@@ -34,7 +34,7 @@ The above example uses secrets as plain strings. It is recommended to use a secr
 | Field              | Required | Details | Example |
 |--------------------|:--------:|---------|---------|
 | `key`   | Y | API key for OpenAI. | `mykey` |
-| `model` | N | The OpenAI LLM to use. Defaults to `gpt-4-turbo`.  | `gpt-4-turbo` |
+| `model` | N | The OpenAI LLM to use. Defaults to `gpt-5-nano` (configurable via `DAPR_CONVERSATION_OPENAI_MODEL` environment variable).  | `${{DAPR_CONVERSATION_OPENAI_MODEL}}` |
 | `cacheTTL` | N | A time-to-live value for a prompt cache to expire. Uses Golang duration format.  | `10m` |
 
 ## Related links