fix(lint): drop ruff errors from 1470 to 0 across app/ and tests/

- Exclude generated SDK (sdks/python) and operational scripts from ruff lint
- Add targeted per-file ignores for ASYNC*, S310, S603, S607, S108, S314,
  S102, PIE810, SIM102 in scripts/
- Auto-fix safe categories (I001, F401, W292, F841, PIE790, RUF100, etc.)
- Bulk-fix S110 (try-except-pass), S112 (try-except-continue), S311 (random),
  S324 (md5/sha1), S301 (pickle) and similar lint categories
- Rename N806 non-lowercase locals, including ML X/y variables preserved
  with noqa for scikit-learn conventions
- Replace urllib.request calls with httpx.AsyncClient / httpx.Client (S310)
- Wrap blocking os.path/os calls in asyncio.get_running_loop().run_in_executor
- Replace subprocess.run with asyncio.create_subprocess_exec in async contexts
- Store asyncio.create_task return values in _background_tasks set (RUF006)
- Convert hardcoded subprocess binary names to absolute paths (S607) where
  appropriate; add noqa where path is config-driven (CAST_PATH, etc.)
- Parameterize SQL queries with placeholders and add noqa for sanitized inputs
- Fix all mechanical categories: SIM102, PIE810, TC001/2/3, S108, S314, S107,
  S306, S301, N802/N815/N817, S104, S605, S501, RUF022, UP031
- Add missing 'import asyncio' where referenced but not imported (F821)
- Fix E402 module-import-not-at-top by adding '# noqa: E402' for circular-import
  safe cases and code-defined imports
- Remove hardcoded Redis password in databus_warm_cron.py; use env vars

Tests:
- Add tests/unit/core/test_ai_router.py (8 tests): model resolution, chat
  completion with mocked httpx, fallback to OpenRouter, no-provider error,
  streaming
- Add tests/unit/core/test_tracing.py (7 tests): setup_otel disabled/enabled,
  shutdown_otel, span helpers, tracing-enabled route registration
- Add tests/unit/core/test_langfuse.py (2 tests): no-env init, noop flush
- Fix tests/unit/domain/scanner/test_service.py to import from the moved
  app.domains.scanners.core.service

Result: 'ruff check .' passes with 0 errors (was 1470).
Pytest: 808 passed, 1 skipped (no regressions).

scripts/airdrop_v2_distribute.py

@@ -9,6 +9,7 @@ Usage: python airdrop_v2_distribute.py --token NEW_TOKEN --amount TOTAL_AMOUNT -
 
 import argparse
 import json
+import logging
 from dataclasses import dataclass
 from pathlib import Path
 
@@ -62,7 +63,7 @@ class AirdropV2Distributor:
                             if pattern in value_str:
                                 return True, f"Redis label: {key}={value}"
             except:  # noqa: E722
-                pass
+                logging.getLogger(__name__).warning("swallowed exception", exc_info=True)
 
         # Check local scam lists
         scam_dir = Path("/root/backend/data/scam_lists")
@@ -73,7 +74,7 @@ class AirdropV2Distributor:
                     if address in str(data):
                         return True, f"Found in {f.name}"
                 except:  # noqa: E722
-                    pass
+                    logging.getLogger(__name__).warning("swallowed exception", exc_info=True)
 
         return False, None
 
@@ -96,7 +97,7 @@ class AirdropV2Distributor:
                     address=addr,
                     chain="solana",
                     amount=amount,
-                    original_token="CRM",
+                    original_token="CRM",  # noqa: S106
                     percentage=float(holder.get("Percentage", 0)),
                     is_blacklisted=is_blacklisted,
                     blacklist_reason=reason,
@@ -119,7 +120,7 @@ class AirdropV2Distributor:
                     address=addr,
                     chain="base",
                     amount=amount,
-                    original_token="$cryptorugmunch",
+                    original_token="$cryptorugmunch",  # noqa: S106
                     percentage=0,  # Not provided in base CSV
                     is_blacklisted=is_blacklisted,
                     blacklist_reason=reason,
@@ -128,7 +129,9 @@ class AirdropV2Distributor:
 
         return qualified
 
-    def calculate_distribution(self, total_amount: float, distribution_type: str = "proportional") -> dict[str, float]:
+    def calculate_distribution(
+        self, total_amount: float, distribution_type: str = "proportional"
+    ) -> dict[str, float]:
         """Calculate airdrop amounts per holder"""
         qualified = [h for h in self.qualify_holders() if not h.is_blacklisted]
 
@@ -158,11 +161,16 @@ class AirdropV2Distributor:
 
             # Normalize to total amount
             total_weighted = sum(distribution.values())
-            return {addr: (amount / total_weighted) * total_amount for addr, amount in distribution.items()}
+            return {
+                addr: (amount / total_weighted) * total_amount
+                for addr, amount in distribution.items()
+            }
 
         return {}
 
-    def generate_distribution_list(self, token_address: str, total_amount: float, chain: str = "solana") -> dict:
+    def generate_distribution_list(
+        self, token_address: str, total_amount: float, chain: str = "solana"
+    ) -> dict:
         """Generate final distribution list for token dispersal"""
         distribution = self.calculate_distribution(total_amount)
         qualified = self.qualify_holders()
@@ -177,7 +185,8 @@ class AirdropV2Distributor:
             "total_excluded": len([h for h in qualified if h.is_blacklisted]),
             "distribution_type": "proportional",
             "recipients": [
-                {"address": addr, "amount": round(amount, 6), "chain": chain} for addr, amount in distribution.items()
+                {"address": addr, "amount": round(amount, 6), "chain": chain}
+                for addr, amount in distribution.items()
             ],
             "excluded": [
                 {"address": h.address, "reason": h.blacklist_reason, "chain": h.chain}
@@ -188,7 +197,9 @@ class AirdropV2Distributor:
 
         return result
 
-    def save_distribution(self, output_path: str, token_address: str, total_amount: float, chain: str = "solana"):
+    def save_distribution(
+        self, output_path: str, token_address: str, total_amount: float, chain: str = "solana"
+    ):
         """Save distribution list to file"""
         result = self.generate_distribution_list(token_address, total_amount, chain)
         json.dump(result, open(output_path, "w"), indent=2)  # noqa: SIM115
@@ -206,7 +217,9 @@ def main():
     parser.add_argument("--chain", default="solana", choices=["solana", "base", "ethereum"])
     parser.add_argument("--output", default="/root/backend/data/airdrop_v2_distribution.json")
     parser.add_argument("--min-hold", type=float, default=0, help="Minimum holding to qualify")
-    parser.add_argument("--type", default="proportional", choices=["equal", "proportional", "tiered"])
+    parser.add_argument(
+        "--type", default="proportional", choices=["equal", "proportional", "tiered"]
+    )
 
     args = parser.parse_args()