feat: Phase 1 — JA3/JA3S sniffer, Attacker model, profile worker

Add passive TLS fingerprinting via a sniffer container on the MACVLAN
interface, plus the Attacker table and periodic rebuild worker that
correlates per-IP profiles from Log + Bounty + CorrelationEngine.

- templates/sniffer/: Scapy sniffer with pure-Python TLS parser;
  emits tls_client_hello / tls_session RFC 5424 lines with ja3, ja3s,
  sni, alpn, raw_ciphers, raw_extensions; GREASE filtered per RFC 8701
- decnet/services/sniffer.py: service plugin (no ports, NET_RAW/NET_ADMIN)
- decnet/web/db/models.py: Attacker SQLModel table + AttackersResponse
- decnet/web/db/repository.py: 5 new abstract methods
- decnet/web/db/sqlite/repository.py: implement all 5 (upsert, pagination,
  sort by recent/active/traversals, bounty grouping)
- decnet/web/attacker_worker.py: 30s periodic rebuild via CorrelationEngine;
  extracts commands from log fields, merges fingerprint bounties
- decnet/web/api.py: wire attacker_profile_worker into lifespan
- decnet/web/ingester.py: extract JA3 bounty (fingerprint_type=ja3)
- development/DEVELOPMENT.md: full attacker intelligence collection roadmap
- pyproject.toml: scapy>=2.6.1 added to dev deps
- tests: test_sniffer_ja3.py (40+ vectors), test_attacker_worker.py,
  test_base_repo.py / test_web_api.py updated for new surface

decnet/web/db/repository.py

@@ -90,3 +90,34 @@ class BaseRepository(ABC):
     async def set_state(self, key: str, value: Any) -> None:
         """Store a specific state entry by key."""
         pass
+
+    @abstractmethod
+    async def get_all_logs_raw(self) -> list[dict[str, Any]]:
+        """Retrieve all log rows with fields needed by the attacker profile worker."""
+        pass
+
+    @abstractmethod
+    async def get_all_bounties_by_ip(self) -> dict[str, list[dict[str, Any]]]:
+        """Retrieve all bounty rows grouped by attacker_ip."""
+        pass
+
+    @abstractmethod
+    async def upsert_attacker(self, data: dict[str, Any]) -> None:
+        """Insert or replace an attacker profile record."""
+        pass
+
+    @abstractmethod
+    async def get_attackers(
+        self,
+        limit: int = 50,
+        offset: int = 0,
+        search: Optional[str] = None,
+        sort_by: str = "recent",
+    ) -> list[dict[str, Any]]:
+        """Retrieve paginated attacker profile records."""
+        pass
+
+    @abstractmethod
+    async def get_total_attackers(self, search: Optional[str] = None) -> int:
+        """Retrieve the total count of attacker profile records, optionally filtered."""
+        pass