docs(activation-service): correct the ACTIVATION_AMOUNT guidance

[sameh-farouk]

Follow-up to #1105/#1109. Two documentation errors of mine, found while checking whether ACTIVATION_AMOUNT is chart-specific.

The .env example contradicted the chart

readme.md      ACTIVATION_AMOUNT=1        -> 10,000,000 base units = 1 TFT
values.yaml    activation_amount: 0.1     ->  1,000,000 base units = 0.1 TFT

Both are meant to be the recommended starting value. Anyone deploying from the readme with Docker or locally would have funded ten times the Kubernetes default, and ten times what the service actually pays out today. Example changed to 0.1.

It documented a default that cannot happen

The readme said the value "defaults to 0.1 when unset", then a few lines later that it "is required, so set it explicitly even though it has a default". Both, in the same file.

bin/www lists ACTIVATION_AMOUNT in REQUIRED_ENV_VARIABLES and refuses to start without it, so the fallback in lib/config.js is unreachable through the normal entrypoint — it only applies to callers that bypass it, such as the tests. Confirmed:

$ MNEMONIC=... URL=... node ./bin/www          # ACTIVATION_AMOUNT unset
"msg":"Missing env variables"
"msg":"failed to run startup actions, closing service"

Now stated once, accurately.

The unit does not depend on the deployment method

Worth making explicit, since it was the question that prompted this. ACTIVATION_AMOUNT is read straight from process.env in lib/config.js, so it is whole TFT for Helm, docker run -e, and a local .env alike — the unit is a property of the application, not of how it is deployed.

The image sets no environment variables of its own (no ENV or ARG in the Dockerfile), so every deployment must supply all three. The deployment section now shows a docker run invocation instead of telling the reader to "configure the environment variables listed above", and points at the chart for the Kubernetes equivalent.

Verification

ACTIVATION_AMOUNT=0.1  -> 1000000 base units  = 0.1 TFT
ACTIVATION_AMOUNT=1    -> 10000000 base units = 1.0 TFT
unset                  -> refuses to start

Lint and unit tests pass. Documentation only — no code changes.

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