fix(config): throw on invalid/out-of-range port env vars

[konard]

Summary

Fixes #317 — loadConfig silently dropped invalid TELETON_WEBUI_PORT / TELETON_API_PORT values instead of failing fast.

• Introduced parseEnvPort(name, value) that throws a descriptive error when the value is non-numeric or outside the valid 1–65535 range.
• Replaced the two silent-ignore blocks (TELETON_WEBUI_PORT, TELETON_API_PORT) with calls to parseEnvPort, aligning them with the existing fail-fast behaviour of TELETON_TG_API_ID and TELETON_BASE_URL.
• parseEnvPort is exported so callers and plugins can reuse it.

How to reproduce the issue

TELETON_WEBUI_PORT=abc teleton start   # was: bound on default port 7777 silently
                                        # now: throws Invalid TELETON_WEBUI_PORT

Regression tests added

Scenario	Expected
TELETON_WEBUI_PORT=abc	throws Invalid TELETON_WEBUI_PORT … not a valid integer
TELETON_WEBUI_PORT=99999	throws Invalid TELETON_WEBUI_PORT … out of valid port range
TELETON_WEBUI_PORT=8080	resolves to 8080
TELETON_API_PORT=abc	throws Invalid TELETON_API_PORT … not a valid integer
TELETON_API_PORT=99999	throws Invalid TELETON_API_PORT … out of valid port range
TELETON_API_PORT=7778	resolves to 7778

All previously existing config loader tests continue to pass.

[konard]

Solution summary

Done. Here's a summary of what was implemented:

Changes made:

1. src/config/loader.ts — Added parseEnvPort(name, value) function that throws with a descriptive message when a port env var is non-numeric or outside 1–65535. Replaced the two silent-drop blocks for TELETON_WEBUI_PORT and TELETON_API_PORT with calls to this function, matching the existing fail-fast behavior of TELETON_TG_API_ID and TELETON_BASE_URL.

2. src/config/__tests__/loader.test.ts — Updated the old "should ignore invalid TELETON_WEBUI_PORT" test to expect a throw, and added 6 regression tests covering the acceptance criteria from the issue (non-numeric throws, out-of-range throws, valid value succeeds — for both TELETON_WEBUI_PORT and TELETON_API_PORT).

PR: #341 (marked ready for review)

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[konard]

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[konard]

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