fix: profile paths broken in Docker — profiles go to /root/.hermes instead of mounted volume (#7170)

In Docker, HERMES_HOME=/opt/data (set in Dockerfile) and users mount
their .hermes directory to /opt/data. However, profile operations used
Path.home() / '.hermes' which resolves to /root/.hermes in Docker —
an ephemeral container path, not the mounted volume.

This caused:
- Profiles created at /root/.hermes/profiles/ (lost on container recreate)
- active_profile sticky file written to wrong location
- profile list looking at wrong directory

Fix: Add get_default_hermes_root() to hermes_constants.py that detects
Docker/custom deployments (HERMES_HOME outside ~/.hermes) and returns
HERMES_HOME as the root. Also handles Docker profiles correctly
(<root>/profiles/<name> → root is grandparent).

Files changed:
- hermes_constants.py: new get_default_hermes_root()
- hermes_cli/profiles.py: _get_default_hermes_home() delegates to shared fn
- hermes_cli/main.py: _apply_profile_override() + _invalidate_update_cache()
- hermes_cli/gateway.py: _profile_suffix() + _profile_arg()
- Tests: 12 new tests covering Docker scenarios

tests/hermes_cli/test_gateway_service.py

@@ -755,6 +755,7 @@ class TestProfileArg:
         hermes_home = tmp_path / ".hermes"
         hermes_home.mkdir()
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
+        monkeypatch.setenv("HERMES_HOME", str(hermes_home))
         result = gateway_cli._profile_arg(str(hermes_home))
         assert result == ""
 
@@ -763,6 +764,7 @@ class TestProfileArg:
         profile_dir = tmp_path / ".hermes" / "profiles" / "mybot"
         profile_dir.mkdir(parents=True)
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path / ".hermes"))
         result = gateway_cli._profile_arg(str(profile_dir))
         assert result == "--profile mybot"
 
@@ -771,6 +773,7 @@ class TestProfileArg:
         custom_home = tmp_path / "custom" / "hermes"
         custom_home.mkdir(parents=True)
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path / ".hermes"))
         result = gateway_cli._profile_arg(str(custom_home))
         assert result == ""
 
@@ -779,6 +782,7 @@ class TestProfileArg:
         nested = tmp_path / ".hermes" / "profiles" / "mybot" / "subdir"
         nested.mkdir(parents=True)
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path / ".hermes"))
         result = gateway_cli._profile_arg(str(nested))
         assert result == ""
 
@@ -787,6 +791,7 @@ class TestProfileArg:
         bad_profile = tmp_path / ".hermes" / "profiles" / "My Bot!"
         bad_profile.mkdir(parents=True)
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path / ".hermes"))
         result = gateway_cli._profile_arg(str(bad_profile))
         assert result == ""