refactor: rename BYTEDANCE to BYTEPLUS and migrate to provider mixins (withceleste#84)

* refactor(capabilities): rename bytedance provider directories to byteplus

Rename provider directories from 'bytedance' to 'byteplus' in both
image-generation and video-generation capabilities to align with updated
naming convention.

## Changes
- Image generation: Rename bytedance/ → byteplus/ (7 files)
- Video generation: Rename bytedance/ → byteplus/ (7 files)
- Includes: README, __init__, client, config, models, parameters, streaming

This is a directory rename only. Import statements and enum references
will be updated in subsequent commits.

* refactor: rename BYTEDANCE to BYTEPLUS across codebase

Update Provider enum, credentials, class names, variables, docstrings,
and all references from ByteDance/BYTEDANCE/bytedance to BytePlus/BYTEPLUS/byteplus.

## Core Changes
- Provider enum: BYTEDANCE → BYTEPLUS in core.py
- Credentials: bytedance_api_key → byteplus_api_key, BYTEDANCE_API_KEY → BYTEPLUS_API_KEY
- Package name: celeste_bytedance → celeste_byteplus

## Capability Changes
- Class names: ByteDance* → BytePlus* (clients, streams)
- Variable names: BYTEDANCE_* → BYTEPLUS_* (MODELS, PARAMETER_MAPPERS, etc.)
- Docstrings/comments: ByteDance → BytePlus
- Provider references: Provider.BYTEDANCE → Provider.BYTEPLUS
- README files: Update environment variable names and provider names
- Tests: Update Provider.BYTEDANCE → Provider.BYTEPLUS
- Keywords: bytedance → byteplus in pyproject.toml

## Files Updated
- Core: core.py, credentials.py
- Image generation: client, models, parameters, streaming, config, __init__, README
- Video generation: client, models, parameters, config, __init__, README
- Tests: integration tests for both capabilities
- Provider package: byteplus provider package files

* chore(capabilities): remove redundant BytePlus config files and migrate to mixins

Remove unused config.py files from BytePlus capability providers and migrate
clients to use provider package mixins following the established pattern.

## Changes
- Remove image-generation/providers/byteplus/config.py
- Remove video-generation/providers/byteplus/config.py
- Migrate clients to use BytePlusImagesClient and BytePlusVideosClient mixins
- Add celeste-byteplus workspace dependency to both capability packages
- Simplify client implementations by delegating HTTP requests to mixins

Configuration is now centralized in the provider package (celeste_byteplus.images.config
and celeste_byteplus.videos.config) following the established pattern from
OpenAI, Mistral, and other providers.

* fix(core): change BFL provider value to lowercase 'bfl'

Change BFL provider value from 'Black Forest Labs' to 'bfl' to match
the lowercase convention expected by all providers. This fixes the
test_all_providers_are_lowercase test failure.

Author: Kamilbenkirane

packages/capabilities/image-generation/pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Artificial Intelligence",
     "Typing :: Typed",
 ]
-keywords = ["ai", "image-generation", "dall-e", "imagen", "openai", "google", "bytedance"]
+keywords = ["ai", "image-generation", "dall-e", "imagen", "openai", "google", "byteplus"]
 
 [project.urls]
 Homepage = "https://withceleste.ai"
@@ -28,6 +28,7 @@ Issues = "https://github.com/withceleste/celeste-python/issues"
 [tool.uv.sources]
 celeste-ai = { workspace = true }
 celeste-bfl = { workspace = true }
+celeste-byteplus = { workspace = true }
 celeste-google = { workspace = true }
 celeste-openai = { workspace = true }
 

packages/capabilities/image-generation/src/celeste_image_generation/models.py

@@ -2,15 +2,15 @@
 
 from celeste import Model
 from celeste_image_generation.providers.bfl.models import MODELS as BFL_MODELS
-from celeste_image_generation.providers.bytedance.models import (
-    MODELS as BYTEDANCE_MODELS,
+from celeste_image_generation.providers.byteplus.models import (
+    MODELS as BYTEPLUS_MODELS,
 )
 from celeste_image_generation.providers.google.models import MODELS as GOOGLE_MODELS
 from celeste_image_generation.providers.openai.models import MODELS as OPENAI_MODELS
 
 MODELS: list[Model] = [
     *BFL_MODELS,
-    *BYTEDANCE_MODELS,
+    *BYTEPLUS_MODELS,
     *GOOGLE_MODELS,
     *OPENAI_MODELS,
 ]

packages/capabilities/image-generation/src/celeste_image_generation/providers/__init__.py

@@ -11,8 +11,8 @@ def _get_providers() -> list[tuple[Provider, type[Client]]]:
     from celeste_image_generation.providers.bfl.client import (
         BFLImageGenerationClient,
     )
-    from celeste_image_generation.providers.bytedance.client import (
-        ByteDanceImageGenerationClient,
+    from celeste_image_generation.providers.byteplus.client import (
+        BytePlusImageGenerationClient,
     )
     from celeste_image_generation.providers.google.client import (
         GoogleImageGenerationClient,
@@ -23,7 +23,7 @@ def _get_providers() -> list[tuple[Provider, type[Client]]]:
 
     return [
         (Provider.BFL, BFLImageGenerationClient),
-        (Provider.BYTEDANCE, ByteDanceImageGenerationClient),
+        (Provider.BYTEPLUS, BytePlusImageGenerationClient),
         (Provider.GOOGLE, GoogleImageGenerationClient),
         (Provider.OPENAI, OpenAIImageGenerationClient),
     ]

packages/capabilities/image-generation/src/celeste_image_generation/providers/bytedance/__init__.py

@@ -1,13 +1,13 @@
-# ByteDance Image Generation Provider
+# BytePlus Image Generation Provider
 
 ## Credentials
 
-**Environment variable:** `BYTEDANCE_API_KEY`
+**Environment variable:** `BYTEPLUS_API_KEY`
 
 **Setup:**
 1. Register at [console.byteplus.com](https://console.byteplus.com)
 2. Activate model in ModelArk section
 3. Generate API key with image generation permissions
-4. Set environment variable: `export BYTEDANCE_API_KEY="your-key"`
+4. Set environment variable: `export BYTEPLUS_API_KEY="your-key"`
 
 **Note:** Models must be activated in BytePlus console before use. If you get a 404 error, activate the model or use an Endpoint ID (`ep-xxx`) instead of Model ID.

packages/capabilities/image-generation/src/celeste_image_generation/providers/bytedance/client.py

@@ -0,0 +1,6 @@
+"""BytePlus provider for image generation."""
+
+from .client import BytePlusImageGenerationClient
+from .models import MODELS
+
+__all__ = ["MODELS", "BytePlusImageGenerationClient"]