TLS config crashes in mqtt_api.py and evcc_api.py - tls field used as both bool and dict

[MaStr]

Both mqtt_api.py and evcc_api.py have identical TLS configuration bugs where config['tls'] is checked as a boolean but then accessed as a dictionary.
Location

src/batcontrol/mqtt_api.py lines 92-100
src/batcontrol/evcc_api.py lines 115-123

The Problem

TLS , not tested yet

if config['tls'] is True:
self.client.tls_set(
config['tls']['ca_certs'], # crashes: True['ca_certs']
config['tls']['certfile'],
config['tls']['keyfile'],
cert_reqs=config['tls']['cert_reqs'],
tls_version=config['tls']['tls_version'],
ciphers=config['tls']['ciphers']
)

The code checks config['tls'] is True (a boolean), then immediately tries to subscript it as a dict (config['tls']['ca_certs']). This will always crash with TypeError: 'bool' object is not subscriptable when TLS is enabled.
Expected Behavior

The TLS fields are defined as sibling keys in the config, not nested under tls:

mqtt:
tls: false
cafile: /etc/ssl/certs/ca-certificates.crt
certfile: /etc/ssl/certs/client.crt
keyfile: /etc/ssl/certs/client.key
tls_version: tlsv1.2

How to Reproduce

Set tls: true in the mqtt or evcc config section. Batcontrol crashes on startup.
Suggested Fix

if config['tls'] is True:
self.client.tls_set(
config.get('cafile'),
config.get('certfile'),
config.get('keyfile'),
tls_version=config.get('tls_version'),
)

Found during Pydantic config model audit.