feat(lora): per LoRA-model configurable weight range

[lstein]

Summary

• The LoRA weight slider was previously hard-coded to a -1.0..+2.0 range. Slider-style LoRAs that operate at larger scales (e.g. -10..+10) couldn't be driven to their useful values from the UI.
• This PR adds optional weight_min and weight_max fields to LoraModelDefaultSettings, exposes them in the model edit panel as toggleable spinners (alongside a re-labeled "Starting Weight" spinner), and makes the canvas LoRA card's slider honor whatever range the user saved on the model. The previous -1..+2 hard cap on weight is removed.

Setting the min and max weights from within the Model Manager:

The LoRA slider with custom min and max ranges

Changes

• Backend (invokeai/backend/model_manager/configs/lora.py): LoraModelDefaultSettings gains weight_min and weight_max (both optional, default None); a model validator rejects weight_min >= weight_max. Removed the ge=-1, le=2 constraint on weight.
• Model edit panel: Three spinners in a single row — Starting Weight / Min Weight / Max Weight — each independently toggleable. Client-side validation surfaces a toast if min >= max before the PATCH.
• LoRA card (canvas): Slider/number-input bounds are pulled from loraConfig.default_settings.weight_min/max, falling back to the global defaults (-1..+2 slider, -10..+10 number input).
• State: Relaxed the zLoRA.weight zod schema from .gte(-10).lte(10) to plain z.number() so persisted values within a user-set wide range aren't rejected on rehydration.
• Regenerated services/api/schema.ts; added en locale strings.

Test plan

• Edit a LoRA, set Min Weight = -10 and Max Weight = 10, save; reopen the panel and confirm values persist.
• Try saving Min >= Max and confirm the toast prevents the request.
• Add the LoRA to a generation and verify the canvas slider now spans the saved range.
• Edit a LoRA and leave min/max disabled; confirm the canvas slider falls back to -1..+2.
• pnpm lint:tsc, pnpm lint:eslint, pnpm lint:prettier, pnpm lint:knip, pnpm lint:dpdm
• pnpm test:no-watch (1097 passed)
• pytest tests/app/routers/test_model_manager.py tests/backend/model_manager/configs/ (45 passed)

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