Revert "API: generate /api/state documentation from UI types"

[andig]

Reverts #31530 (commit 542a01f).

Follow-up changes on top of it are kept:

• Site: add experimental battery grid discharge setting #32086 batteryGridDischarge setting (types, openapi path)
• Optimizer: surface battery-to-grid discharge as suggestion #32087 discharge battery suggestion action

server/mcp/openapi.json and server/mcp/openapi.md are regenerated with the restored go tool openapi generator.

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🤖 Generated with Claude Code

[sourcery-ai]

Hey - I've left some high level feedback:

• In cmd/openapi/openapi.go, consider validating os.Args length and printing a helpful usage message instead of assuming two arguments are always present to avoid cryptic panics when invoked incorrectly.
• Several TS interfaces in evcc.ts were relaxed or changed (e.g. InfluxConfig.database/org now any, modbusproxy and messagingEvents no longer allow null); double-check these against the actual /api/state payload so the UI types still accurately represent nullable fields and avoid unnecessary any usage.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In cmd/openapi/openapi.go, consider validating os.Args length and printing a helpful usage message instead of assuming two arguments are always present to avoid cryptic panics when invoked incorrectly.
- Several TS interfaces in evcc.ts were relaxed or changed (e.g. InfluxConfig.database/org now `any`, `modbusproxy` and `messagingEvents` no longer allow `null`); double-check these against the actual /api/state payload so the UI types still accurately represent nullable fields and avoid unnecessary `any` usage.

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