feat(core): Add Amazon Bedrock provider support

docs/cli/bedrock.md

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+# Amazon Bedrock Support
+
+Qwen Code now supports using Qwen3-Coder models via Amazon Bedrock, allowing you to leverage AWS infrastructure and security policies while using Qwen models.
+
+## Prerequisites
+
+1. **AWS Account** with access to Amazon Bedrock
+2. **Model Access**: Request access to Qwen models in the [AWS Bedrock Console](https://console.aws.amazon.com/bedrock/)
+3. **AWS Credentials**: Configure AWS credentials on your machine
+
+## Available Models
+
+Amazon Bedrock provides access to Qwen models. Model availability varies by region:
+
+### us-east-1
+
+- `qwen.qwen3-coder-30b-a3b-v1:0` - Qwen3-Coder-30B-A3B-Instruct (code generation)
+- `qwen.qwen3-32b-v1:0` - Qwen3 32B dense (general purpose)
+
+### us-west-2
+
+- `qwen.qwen3-coder-480b-a35b-v1:0` - Qwen3 Coder 480B A35B Instruct (code generation)
+- `qwen.qwen3-235b-a22b-2507-v1:0` - Qwen3 235B A22B 2507 (general purpose)
+- `qwen.qwen3-coder-30b-a3b-v1:0` - Qwen3-Coder-30B-A3B-Instruct (code generation)
+- `qwen.qwen3-32b-v1:0` - Qwen3 32B dense (general purpose)
+
+Check the [AWS Bedrock Console](https://console.aws.amazon.com/bedrock/) for the latest available models in your region.
+
+## Setup
+
+### 1. Configure AWS Credentials
+
+Qwen Code uses the standard AWS credential chain. Choose one of the following methods:
+
+#### Option A: Environment Variables
+
+```bash
+export AWS_ACCESS_KEY_ID=your_access_key_id
+export AWS_SECRET_ACCESS_KEY=your_secret_access_key
+export AWS_REGION=us-east-1  # Optional, defaults to us-east-1
+```
+
+#### Option B: AWS Profile
+
+```bash
+export AWS_PROFILE=your-profile-name
+export AWS_REGION=us-east-1  # Optional
+```
+
+#### Option C: AWS Credentials File
+
+The AWS SDK will automatically use credentials from `~/.aws/credentials`:
+
+```ini
+[default]
+aws_access_key_id = your_access_key_id
+aws_secret_access_key = your_secret_access_key
+region = us-east-1
+```
+
+### 2. Select Bedrock in Qwen Code
+
+When starting Qwen Code, select "Amazon Bedrock" from the authentication menu using `/auth` command.
+
+### 3. (Optional) Configure Model
+
+By default, Qwen Code uses `qwen.qwen3-coder-30b-a3b-v1:0` (Qwen3-Coder-30B). You can override this with environment variables or in settings:
+
+```bash
+# Via environment variable - use the exact Bedrock model ID
+export BEDROCK_MODEL=qwen.qwen3-32b-v1:0
+```
+
+```json
+// Or in ~/.qwen/settings.json - use the exact Bedrock model ID
+{
+  "authType": "bedrock",
+  "model": "qwen.qwen3-coder-30b-a3b-v1:0"
+}
+```
+
+## Configuration Options
+
+### Environment Variables
+
+| Variable                | Description              | Default                         |
+| ----------------------- | ------------------------ | ------------------------------- |
+| `AWS_REGION`            | AWS region for Bedrock   | `us-east-1`                     |
+| `AWS_PROFILE`           | Named AWS profile to use | None                            |
+| `AWS_ACCESS_KEY_ID`     | AWS access key           | None                            |
+| `AWS_SECRET_ACCESS_KEY` | AWS secret key           | None                            |
+| `BEDROCK_MODEL`         | Full Bedrock model ID    | `qwen.qwen3-coder-30b-a3b-v1:0` |
+
+**Note**: You must use the exact Bedrock model ID (e.g., `qwen.qwen3-coder-30b-a3b-v1:0`). Model name shortcuts are not supported.