docs: add uniform token pricing providers to best use cases

Mention providers like Cerebras that bill cached tokens at the same rate as regular input tokens, making DCP purely beneficial with no cache-miss penalty.

Author: azais-corentin

README.md

@@ -49,15 +49,18 @@ LLM providers like Anthropic and OpenAI cache prompts based on exact prefix matc
 
 > **Note:** In testing, cache hit rates were approximately 65% with DCP enabled vs 85% without.
 
-**Best use case:** Providers that count usage in requests, such as Github Copilot and Google Antigravity have no negative price impact.
+**Best use cases:**
+
+- **Request-based billing** — Providers that count usage in requests, such as Github Copilot and Google Antigravity, have no negative price impact.
+- **Uniform token pricing** — Providers that bill cached tokens at the same rate as regular input tokens, such as Cerebras, see pure savings with no cache-miss penalty.
 
 ## Configuration
 
 DCP uses its own config file:
 
 - Global: `~/.config/opencode/dcp.jsonc` (or `dcp.json`), created automatically on first run
 - Custom config directory: `$OPENCODE_CONFIG_DIR/dcp.jsonc` (or `dcp.json`), if `OPENCODE_CONFIG_DIR` is set
-- Project: `.opencode/dcp.jsonc` (or `dcp.json`) in your project’s `.opencode` directory
+- Project: `.opencode/dcp.jsonc` (or `dcp.json`) in your project's `.opencode` directory
 
 <details>
 <summary><strong>Default Configuration</strong> (click to expand)</summary>