feat: Implement admin settings UI, enhance admin authentication with password hashing, and add new streaming runtime logic for Claude and OpenAI adapters with extensive compatibility tests.

tests/compat/expected/token_cases.json

@@ -0,0 +1,7 @@
+{
+  "cases": [
+    {"name": "ascii_short", "tokens": 1},
+    {"name": "cjk", "tokens": 3},
+    {"name": "mixed", "tokens": 4}
+  ]
+}