rename frank-small → frank-secondary (Dankclaw llama.cpp :7771)

Cross-cutting rename of the current llama.cpp endpoint on the RTX 3090
(port 7771) from frank-small to frank-secondary:

- Service trio: scripts/{frank-small.env,frank-small.service,
  serve-frank-small.sh,download-frank-small.sh} → frank-secondary.*
- Test: tests/frank_small_unit.bats → tests/frank_secondary_unit.bats
- Runbooks: serverAppConfigs-docs/LLM/frank-small-*.md →
  frank-secondary-*.md (9 files); the FreeToken runbook stays
  freetoken-frank-small.md (it documents the retired CUDA-era service)
- Identifiers: FRANK_SMALL→FRANK_SECONDARY, llm_small→llm_secondary,
  LLM_SMALL_*→LLM_SECONDARY_*, deploy_llm_small→deploy_llm_secondary
- Historical references to the OLD frank-small (FreeToken/CUDA on the
  3090, and the Dankserver service that became frank-medium) are
  preserved verbatim — they describe what the service was called
  at the time.

serverAppConfigs-docs/Research/popular-self-hosted-ai-apps.html

@@ -227,7 +227,7 @@
 
   <div class="app">
     <div class="app-head"><h3>llama.cpp <span class="fit exc">EXCELLENT</span></h3><span class="tag"><span class="st">129,149★</span> · MIT · LLM runtime</span></div>
-    <p>The reference GGUF inference engine; <code>llama-server</code> exposes an OpenAI-compatible endpoint. Backbone of this fleet's frank-small/frank-large endpoints. Runs on CPU, CUDA, ROCm, Vulkan, Metal.</p>
+    <p>The reference GGUF inference engine; <code>llama-server</code> exposes an OpenAI-compatible endpoint. Backbone of this fleet's frank-secondary/frank-large endpoints. Runs on CPU, CUDA, ROCm, Vulkan, Metal.</p>
   </div>
 
   <div class="app">