When GGUF image model fails to load with llama.cpp, try loading with stable-diffusion-cpp-python (sd.cpp) as fallback.

Tell user to update llama.cpp instead of falling back to diffusers.

This reverts commit 596d1245.

If llama.cpp fails to load a GGUF image model (e.g., unsupported architecture like lumina2), try loading via diffusers instead.

GGUF files can have different version bytes after 'GGUF' (e.g., GGUF\x03 for version 3).
Changed magic byte check from exact match to prefix check.

Changed condition from 'only if no audio models' to 'always when image_models is configured'.
This ensures the image model downloads at startup even when audio models are present.

- Removed redundant 'import os' statements inside functions (lines 4522, 4926, 5005)
- Added back missing 'from llama_cpp import Llama' that was accidentally deleted
- Global 'import os' at line 12 is now the only one

This fixes the UnboundLocalError when running --list-cached-models or other CLI options.

- --list-cached-models: List all cached models with sizes
- --remove-all-models: Remove all cached models
- --remove-model <modelid>: Remove specific model by name/hash (partial match)

- Check if downloaded file is valid GGUF (magic bytes = 'GGUF')
- If not valid, show clear error that URL is wrong (returns HTML instead)
- Explain that URL must be direct download link ending in .gguf

- Enable verbose=True in llama.cpp to see actual error
- Print GGUF model file size for debugging
- Add try/except with traceback to see detailed errors

- Check if model is URL before any processing
- Use original model name with query params for URL download
- Strip query params only for HuggingFace repo ID parsing
- Added more debug output to trace issues

- Strip query parameters from model name before processing
- Handle URLs with ?download=true or other query params

- Detect if image model is GGUF (ends with .gguf or contains 'gguf')
- If GGUF, load using llama.cpp (same as text Vulkan models)
- If diffusers model, load using Stable Diffusion pipeline
- Fixed both locations where image model preloading happens
- Now supports both GGUF and diffusers image generation models

- Fixed bug where image model wasn't actually being loaded when --loadall was specified
- The code only printed messages but never loaded the diffusers pipeline
- Now actually loads the Stable Diffusion pipeline using diffusers library
- Tries StableDiffusionXLPipeline first, falls back to generic DiffusionPipeline
- Moves to GPU if CUDA available, enables attention slicing for memory efficiency
- Also fixes second location where image model is the only configured model

- Debug command line output was already implemented

- Fixed undefined variable bug where model_name wasn't defined in scope
- Fixed duplicate model loading when using --loadall/--loadswap with multiple models
- First model is now only loaded once (skipped in loop if already loaded)
- Loadall mode now properly preloads all models in VRAM respecting offload strategy
- Loadswap mode properly loads additional models to RAM
- Ondemand mode doesn't reload first model

Feature 1: --debug now shows full command line as first output
Feature 2: --loadall with multiple models now preloads all in VRAM

- Move whisper-server check before audio_model check
- Now whisper-server will be used if available, regardless of audio_model setting
- Also update multi_model_manager.audio_models with cached path

- WhisperServerManager.start() now returns actual model path (useful for URL -> cached path)
- Update audio_models[0] with cached path after downloading
- Store actual_model_path in current_model instead of original URL

- Changed default port from 8081 to 8744 (less common)
- Check if port is available before using, auto-find available port if needed
- Download URL models before starting whisper-server (use model cache)

- Add WhisperServerManager class to manage whisper-server subprocess
- Add --whisper-server argument to specify whisper-server binary path
- Add --whisper-server-port argument for port configuration (default 8081)
- Modify audio transcription endpoint to proxy to whisper-server
- Add cleanup on shutdown to stop whisper-server
- Model can stay loaded in VRAM as long as the server runs

Fix remaining occurrences of model_name (singular) being used instead
of model_names (list) in main function.

Fixed bug where model_name (singular) was used instead of model_names (list)
in several places, causing UnboundLocalError when running without --model.

- CLI (coder): Add --alias argument to create model aliases
- Config: Add model_aliases dict and resolve_model() method
- Server (coderai): Add server-side alias support with --model-alias
- Aliases are resolved in both client and server when making API calls
- Aliases appear in /v1/models endpoint
- Aliases are persisted in config file

- Add QueueManager class to track waiting requests
- Send 'waiting for model...' frames with time counter at regular intervals
- Send 'Model starting' frame when model begins processing
- Add x_queue_info field to streaming response frames for queue status
- Track queue position and wait time for each client

- Add support for multiple --audio-model arguments (action='append')
- Add support for multiple --image-model arguments (action='append')
- Add 'audio' alias pointing to first audio model
- Add 'vision'/'image' aliases pointing to first image model
- Update MultiModelManager to store audio_models and image_models as lists
- Add audio_model and image_model properties for accessing first model
- Update get_model_for_request to handle aliases
- Update list_models to show all models and aliases
- Fix remaining references in main function to use list-based variables

- Changed --model to -m
- Changed --output to -otxt (output as text)
- Changed --device to -dev
- Changed --file to -f for input audio

The args variable was not accessible in the create_transcription function,
causing a NameError when using --whisper-cpp CLI option. This fix adds
global_args to store the parsed arguments for access in endpoint functions.