Remove unused diffrhythm-random-generation workflow

Removed diffrhythm-random-generation-v1.json as it's no longer needed.
Keeping only the essential DiffRhythm workflows:
- simple text-to-music (95s)
- full-length generation (4m45s)
- reference-based style transfer

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

comfyui/workflows/text-to-music/diffrhythm-random-generation-v1.json

@@ -1,143 +0,0 @@
-{
-  "last_node_id": 3,
-  "last_link_id": 2,
-  "nodes": [
-    {
-      "id": 1,
-      "type": "DiffRhythmRun",
-      "pos": [100, 100],
-      "size": [400, 400],
-      "flags": {},
-      "order": 0,
-      "mode": 0,
-      "outputs": [
-        {
-          "name": "AUDIO",
-          "type": "AUDIO",
-          "links": [1, 2]
-        }
-      ],
-      "properties": {
-        "Node name for S&R": "DiffRhythmRun"
-      },
-      "widgets_values": [
-        "cfm_model_v1_2.pt",
-        "",
-        true,
-        "euler",
-        30,
-        1,
-        "speed",
-        -1,
-        "randomize",
-        false,
-        "[-1, 20], [60, -1]"
-      ],
-      "title": "DiffRhythm Random Generation (No Prompt)"
-    },
-    {
-      "id": 2,
-      "type": "PreviewAudio",
-      "pos": [600, 100],
-      "size": [300, 100],
-      "flags": {},
-      "order": 1,
-      "mode": 0,
-      "inputs": [
-        {
-          "name": "audio",
-          "type": "AUDIO",
-          "link": 1
-        }
-      ],
-      "properties": {
-        "Node name for S&R": "PreviewAudio"
-      },
-      "title": "Preview Audio"
-    },
-    {
-      "id": 3,
-      "type": "SaveAudio",
-      "pos": [600, 250],
-      "size": [300, 100],
-      "flags": {},
-      "order": 2,
-      "mode": 0,
-      "inputs": [
-        {
-          "name": "audio",
-          "type": "AUDIO",
-          "link": 2
-        }
-      ],
-      "properties": {
-        "Node name for S&R": "SaveAudio"
-      },
-      "widgets_values": [
-        "diffrhythm_random_output"
-      ],
-      "title": "Save Audio"
-    }
-  ],
-  "links": [
-    [1, 1, 0, 2, 0, "AUDIO"],
-    [2, 1, 0, 3, 0, "AUDIO"]
-  ],
-  "groups": [],
-  "config": {},
-  "extra": {
-    "workflow_info": {
-      "name": "DiffRhythm Random Generation v1",
-      "description": "Random music generation without any prompt or guidance - pure AI creativity",
-      "version": "1.0.0",
-      "author": "valknar@pivoine.art",
-      "category": "text-to-music",
-      "tags": ["diffrhythm", "music-generation", "random", "no-prompt", "discovery"],
-      "requirements": {
-        "custom_nodes": ["ComfyUI_DiffRhythm"],
-        "models": ["ASLP-lab/DiffRhythm-1_2", "ASLP-lab/DiffRhythm-vae", "OpenMuQ/MuQ-MuLan-large", "OpenMuQ/MuQ-large-msd-iter", "FacebookAI/xlm-roberta-base"],
-        "vram_min": "12GB",
-        "vram_recommended": "16GB",
-        "system_deps": ["espeak-ng"]
-      },
-      "usage": {
-        "model": "cfm_model_v1_2.pt (DiffRhythm 1.2 - 95s generation)",
-        "style_prompt": "Empty string for random generation (no guidance)",
-        "unload_model": "Boolean to unload model after generation (default: true)",
-        "odeint_method": "ODE solver: euler (default)",
-        "steps": "Number of diffusion steps: 30 (default)",
-        "cfg": "Classifier-free guidance: 1 (minimal guidance for random output)",
-        "quality_or_speed": "Generation mode: speed (default)",
-        "seed": "-1 for random seed each generation, or specific number for reproducibility",
-        "edit": "false (no editing)",
-        "note": "NO prompt, NO guidance, NO reference audio - pure random generation"
-      },
-      "use_cases": [
-        "Discovery: Explore what the model can create without constraints",
-        "Inspiration: Generate unexpected musical ideas and styles",
-        "Testing: Quick way to verify model is working correctly",
-        "Ambient music: Create random background music for various uses",
-        "Sample generation: Generate large batches of diverse music samples"
-      ],
-      "workflow_tips": [
-        "Run multiple times to discover different musical styles",
-        "Use seed=-1 for completely random output each time",
-        "Use fixed seed to reproduce interesting random results",
-        "Batch process: Run 10-20 times to find interesting compositions",
-        "Save any interesting results with their seed numbers",
-        "Empty style_prompt with cfg=1 produces truly random output"
-      ],
-      "notes": [
-        "This workflow demonstrates DiffRhythm's ability to generate music without any input",
-        "All DiffRhythm parameters except model are at their most permissive settings",
-        "Empty string for style_prompt means no guidance from text",
-        "cfg=1 provides minimal guidance, maximizing randomness",
-        "Results can range from ambient to energetic, classical to electronic",
-        "Each generation is unique (with seed=-1)",
-        "Generation time: ~30-60 seconds on RTX 4090",
-        "Perfect for discovering unexpected musical combinations"
-      ]
-    }
-  },
-  "version": 0.4
-}