fix(rotator_library): 🐛 update gemini-2.5-pro quota

Updates the quota tracker for `gemini-2.5-pro` from 1000 to 1.

Also in this commit:
- refactor: remove redundant `_get_antigravity_logs_dir` function in favor of centralized path management

Author: Mirrowel

src/rotator_library/providers/antigravity_provider.py

@@ -223,9 +223,6 @@ def __init__(self, finish_message: str, raw_response: Dict[str, Any]):
 
 
 # Directory paths - use centralized path management
-def _get_antigravity_logs_dir():
-    return get_logs_dir() / "antigravity_logs"
-
 
 def _get_antigravity_cache_dir():
     return get_cache_dir(subdir="antigravity")
@@ -485,8 +482,6 @@ def _generate_stable_session_id(contents: List[Dict[str, Any]]) -> str:
     Uses SHA256 hash of the first user message to create a deterministic
     session ID, ensuring the same conversation gets the same session ID.
     Falls back to random session ID if no user message found.
-
-    Per CLIProxyAPI Go implementation: generateStableSessionID()
     """
     import hashlib
     import struct
@@ -3318,7 +3313,7 @@ def _transform_to_antigravity_format(
         )
 
         # Prepend Antigravity agent system instruction to existing system instruction
-        # Per CLIProxyAPI Go buildRequest(): Sets request.systemInstruction.role = "user"
+        # Sets request.systemInstruction.role = "user"
         # and sets parts.0.text to the agent identity/guidelines
         # We preserve any existing parts by shifting them (Antigravity = parts[0], existing = parts[1:])
         #

src/rotator_library/providers/utilities/antigravity_quota_tracker.py

@@ -69,7 +69,7 @@
         # Gemini 2.5 Flash Lite - SEPARATE pool (verified: 0.02% per request = 5000 requests)
         "gemini-2.5-flash-lite": 5000,
         # Gemini 2.5 Pro - UNVERIFIED/UNUSED (assumed 0.1% = 1000 requests)
-        "gemini-2.5-pro": 1000,
+        "gemini-2.5-pro": 1,
     },
     "free-tier": {
         # Claude/GPT-OSS group (verified: 2.0% per request = 50 requests)
@@ -92,7 +92,7 @@
         # Gemini 2.5 Flash Lite - SEPARATE pool (verified: 0.02% per request = 5000 requests)
         "gemini-2.5-flash-lite": 5000,
         # Gemini 2.5 Pro - UNVERIFIED/UNUSED (assumed 0.1% = 1000 requests)
-        "gemini-2.5-pro": 1000,
+        "gemini-2.5-pro": 1,
     },
 }