Add param `localService`

[sias32]

Is your feature request related to a problem? Please describe.
pgscv is running in a container, but it sees the network and ports of all services, which is why it believes that they are local and spams a warning/error in the logs about file unavailability.

{"level":"error","service":"pgscv","time":"2026-06-09T08:15:30Z","message":"get data_directory size failed: lstat /var/lib/postgresql/data: no such file or directory; skip"}
{"level":"error","service":"pgscv","time":"2026-06-09T08:15:30Z","message":"find tablespaces mountpoint failed: lstat /var/lib/postgresql/data: no such file or directory"}
{"level":"error","service":"pgscv","time":"2026-06-09T08:15:30Z","message":"get WAL directory size failed: conn busy"}
{"level":"error","service":"pgscv","time":"2026-06-09T08:15:30Z","message":"find log directory mountpoint failed: lstat /var/lib/postgresql/data/: no such file or directory"}
{"level":"error","service":"pgscv","time":"2026-06-09T08:15:30Z","message":"get total size of temp files failed: conn busy"}

Describe the solution you'd like
Change the logic of the `LocalService' by making a flag to manually specify the type of service, and it is also possible to specify the path to the files.

// Determine is service running locally.
config.localService = isAddressLocal(pgconfig.Host)

config:

system_target: false

# or

services:
  custom_name:
    service_type: postgres
    local_type: false
    local_path: /var/lib/custom_name/postgres/data

[sias32]

Alternatively, you can disable the collectors, but only if their metrics are not important to you:

disable_collectors:
- postgres/logs
- postgres/storage
- postgres/settings