feat: browser access (allowed_origins, CORS with Private Network Access), job cancel, Tomie/Unity adapters, benchmark

Includes earlier uncommitted work: Tomie and Unity adapters, benchmark, structured output, call metrics.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

benchmark.example.json

@@ -0,0 +1,15 @@
+{
+  "game": "D:/Torrents/Pgames/Tomie_Wants_to_Get_Married_Expansion-v1.3801-Win",
+  "input": null,
+  "project_file": "examples/tomie_project.json",
+  "models": [],
+  "batch_sizes": [1, 5, 10],
+  "repeats": 3,
+  "limit": 30,
+  "warmup_lines": 2,
+  "context_length": 8192,
+  "gpu": 1,
+  "port": 8788,
+  "job_timeout": 600,
+  "retries": 2
+}