feat(platform/backend): Add Claude Haiku 4.5 model support (#11179)

### Changes 🏗️

- **Added Claude Haiku 4.5 model support** (`claude-haiku-4-5-20251001`)
- Added model to `LlmModel` enum in
`autogpt_platform/backend/backend/blocks/llm.py`
- Configured model metadata with 200k context window and 64k max output
tokens
- Set pricing to 4 credits per million tokens in
`backend/data/block_cost_config.py`
  
- **Classic Forge Integration**
- Added `CLAUDE4_5_HAIKU_v1` to Anthropic provider in
`classic/forge/forge/llm/providers/anthropic.py`
- Configured with $1/1M prompt tokens and $5/1M completion tokens
pricing
  - Enabled function call API support

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  
  **Test Plan:**
- [x] Verify Claude Haiku 4.5 model appears in the LLM block model
selection dropdown
- [x] Test basic text generation using Claude Haiku 4.5 in an agent
workflow

#### For configuration changes:

- [x] `.env.default` is updated or already compatible with my changes
- [x] `docker-compose.yml` is updated or already compatible with my
changes
- [x] I have included a list of my configuration changes in the PR
description (under **Changes**)

<details>
  <summary>Configuration changes</summary>

  - No environment variable changes required
  - No docker-compose changes needed
- Model configuration is handled through existing Anthropic API
integration
</details>




https://github.com/user-attachments/assets/bbc42c47-0e7c-4772-852e-55aa91f4d253

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Bently <Bentlybro@users.noreply.github.com>

autogpt_platform/backend/backend/blocks/llm.py

@@ -102,6 +102,7 @@ class LlmModel(str, Enum, metaclass=LlmModelMeta):
     CLAUDE_4_OPUS = "claude-opus-4-20250514"
     CLAUDE_4_SONNET = "claude-sonnet-4-20250514"
     CLAUDE_4_5_SONNET = "claude-sonnet-4-5-20250929"
+    CLAUDE_4_5_HAIKU = "claude-haiku-4-5-20251001"
     CLAUDE_3_7_SONNET = "claude-3-7-sonnet-20250219"
     CLAUDE_3_5_SONNET = "claude-3-5-sonnet-latest"
     CLAUDE_3_5_HAIKU = "claude-3-5-haiku-latest"
@@ -217,6 +218,9 @@ MODEL_METADATA = {
     LlmModel.CLAUDE_4_5_SONNET: ModelMetadata(
         "anthropic", 200000, 64000
     ),  # claude-sonnet-4-5-20250929
+    LlmModel.CLAUDE_4_5_HAIKU: ModelMetadata(
+        "anthropic", 200000, 64000
+    ),  # claude-haiku-4-5-20251001
     LlmModel.CLAUDE_3_7_SONNET: ModelMetadata(
         "anthropic", 200000, 64000
     ),  # claude-3-7-sonnet-20250219

autogpt_platform/backend/backend/data/block_cost_config.py

@@ -69,6 +69,7 @@ MODEL_COST: dict[LlmModel, int] = {
     LlmModel.CLAUDE_4_1_OPUS: 21,
     LlmModel.CLAUDE_4_OPUS: 21,
     LlmModel.CLAUDE_4_SONNET: 5,
+    LlmModel.CLAUDE_4_5_HAIKU: 4,
     LlmModel.CLAUDE_4_5_SONNET: 9,
     LlmModel.CLAUDE_3_7_SONNET: 5,
     LlmModel.CLAUDE_3_5_SONNET: 4,