feat: increase Llama max-model-len to 20480

Adjusted VRAM allocation for larger context window:
- Llama: 90% VRAM, 20480 context (up from 8192)
- BGE: 8% VRAM (down from 10%)

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

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

services/vllm/config_bge.yaml

@@ -2,6 +2,6 @@ model: BAAI/bge-large-en-v1.5
 host: "0.0.0.0"
 port: 8002
 uvicorn-log-level: "info"
-gpu-memory-utilization: 0.10
+gpu-memory-utilization: 0.08
 dtype: float16
 task: embed

services/vllm/config_llama.yaml

@@ -2,8 +2,8 @@ model: meta-llama/Llama-3.1-8B-Instruct
 host: "0.0.0.0"
 port: 8001
 uvicorn-log-level: "info"
-gpu-memory-utilization: 0.85
-max-model-len: 8192
+gpu-memory-utilization: 0.90
+max-model-len: 20480
 dtype: auto
 enforce-eager: false
 enable-auto-tool-choice: true