refactor(tests): move flat tests/*.py into per-subsystem subfolders

Groups every flat test_*.py under the module it exercises, matching the
existing tests/{profiler,sniffer,prober,collector,correlation,cli,web,
topology,swarm,bus,updater,api,docker,geoip,...} layout. New folders:
services/, fleet/, config/, logging/, db/ (+ db/mysql/), telemetry/,
mutator/, core/.

Path-dependent __file__ references bumped an extra .parent in three
files that moved one level deeper:
- tests/sniffer/test_sniffer_ja3.py   (template path)
- tests/services/test_ssh_capture_emit.py (template path)
- tests/cli/test_mode_gating.py  (REPO root)
- tests/web/test_env_lazy_jwt.py (repo var)

Also drops two SQLite runtime artifacts (test_decnet.db-{shm,wal}) that
were leaking into the repo from a previous test run.

Fixes two test_service_isolation cases that patched asyncio.sleep (no
longer on the profiler main-loop hot path — same pre-existing bug I
fixed earlier in test_attacker_worker.py) by patching asyncio.wait_for
and passing interval=0.

tests/config/test_config.py

@@ -0,0 +1,143 @@
+"""
+Tests for decnet.config — Pydantic models, save/load/clear state.
+Covers the uncovered lines: validators, save_state, load_state, clear_state.
+"""
+import pytest
+
+import decnet.config as config_module
+from decnet.config import (
+    DeckyConfig,
+    DecnetConfig,
+    save_state,
+    load_state,
+    clear_state,
+)
+
+
+# ---------------------------------------------------------------------------
+# DeckyConfig validator
+# ---------------------------------------------------------------------------
+
+class TestDeckyConfig:
+    def _base(self, **kwargs):
+        defaults = dict(
+            name="decky-01", ip="192.168.1.10", services=["ssh"],
+            distro="debian", base_image="debian", hostname="host-01",
+        )
+        defaults.update(kwargs)
+        return defaults
+
+    def test_valid_decky(self):
+        d = DeckyConfig(**self._base())
+        assert d.name == "decky-01"
+
+    def test_empty_services_raises(self):
+        with pytest.raises(Exception, match="at least 1 item"):
+            DeckyConfig(**self._base(services=[]))
+
+    def test_multiple_services_ok(self):
+        d = DeckyConfig(**self._base(services=["ssh", "smb", "rdp"]))
+        assert len(d.services) == 3
+
+
+# ---------------------------------------------------------------------------
+# DecnetConfig validator
+# ---------------------------------------------------------------------------
+
+class TestDecnetConfig:
+    def _base_decky(self):
+        return DeckyConfig(
+            name="d", ip="10.0.0.2", services=["ssh"],
+            distro="debian", base_image="debian", hostname="h",
+        )
+
+    def test_valid_config(self):
+        cfg = DecnetConfig(
+            mode="unihost", interface="eth0",
+            subnet="10.0.0.0/24", gateway="10.0.0.1",
+            deckies=[self._base_decky()],
+        )
+        assert cfg.mode == "unihost"
+
+    def test_log_file_field(self):
+        cfg = DecnetConfig(
+            mode="unihost", interface="eth0",
+            subnet="10.0.0.0/24", gateway="10.0.0.1",
+            deckies=[self._base_decky()],
+            log_file="/var/log/decnet/decnet.log",
+        )
+        assert cfg.log_file == "/var/log/decnet/decnet.log"
+
+    def test_log_file_defaults_to_none(self):
+        cfg = DecnetConfig(
+            mode="unihost", interface="eth0",
+            subnet="10.0.0.0/24", gateway="10.0.0.1",
+            deckies=[self._base_decky()],
+        )
+        assert cfg.log_file is None
+
+
+# ---------------------------------------------------------------------------
+# save_state / load_state / clear_state
+# ---------------------------------------------------------------------------
+
+@pytest.fixture(autouse=True)
+def patch_state_file(tmp_path, monkeypatch):
+    monkeypatch.setattr(config_module, "STATE_FILE", tmp_path / "decnet-state.json")
+
+
+def _sample_config():
+    return DecnetConfig(
+        mode="unihost", interface="eth0",
+        subnet="192.168.1.0/24", gateway="192.168.1.1",
+        deckies=[
+            DeckyConfig(
+                name="decky-01", ip="192.168.1.10", services=["ssh"],
+                distro="debian", base_image="debian", hostname="host-01",
+            )
+        ],
+    )
+
+
+def test_save_and_load_state(tmp_path):
+    cfg = _sample_config()
+    compose = tmp_path / "docker-compose.yml"
+    save_state(cfg, compose)
+
+    result = load_state()
+    assert result is not None
+    loaded_cfg, loaded_compose = result
+    assert loaded_cfg.mode == "unihost"
+    assert loaded_cfg.deckies[0].name == "decky-01"
+    assert loaded_compose == compose
+
+
+def test_load_state_returns_none_when_missing(tmp_path, monkeypatch):
+    monkeypatch.setattr(config_module, "STATE_FILE", tmp_path / "nonexistent.json")
+    assert load_state() is None
+
+
+def test_clear_state(tmp_path):
+    cfg = _sample_config()
+    save_state(cfg, tmp_path / "compose.yml")
+    assert config_module.STATE_FILE.exists()
+
+    clear_state()
+    assert not config_module.STATE_FILE.exists()
+
+
+def test_clear_state_noop_when_missing(tmp_path, monkeypatch):
+    monkeypatch.setattr(config_module, "STATE_FILE", tmp_path / "nonexistent.json")
+    clear_state()  # should not raise
+
+
+def test_state_roundtrip_preserves_all_fields(tmp_path):
+    cfg = _sample_config()
+    cfg.deckies[0].archetype = "workstation"
+    cfg.deckies[0].mutate_interval = 45
+    compose = tmp_path / "compose.yml"
+    save_state(cfg, compose)
+
+    loaded_cfg, _ = load_state()
+    assert loaded_cfg.deckies[0].archetype == "workstation"
+    assert loaded_cfg.deckies[0].mutate_interval == 45