fix: omit thinking field for GLM-5.3 / GLM-5.3-Flash

[OnesoftQwQ]

Changes

1. New model capability: supportsThinkingParam

• Added supportsThinkingParam (default true) to ModelMeta, ModelMetaOverride and OpenCodeGoModelItem, wired through the catalog merge chain and getCatalogModelConfig().
• When false, the OpenAI Chat and Anthropic adapters omit the top-level thinking field entirely, and buildReasoningEnum() stops offering the "禁用思考" option since no request may disable thinking.
• Applied the same opt-out to both vision-proxy request builders in provider.ts.

2. GLM-5.3 / GLM-5.3-Flash overrides

• Marked glm-5.3 and glm-5.3-flash as thinkingMode: "always" + supportsThinkingParam: false in MODEL_OVERRIDES.
• These models always think and their upstream rejects the thinking field with 400 json: unknown field "thinking" (issue 400 Error when using GLM5.3 flash #129); requests now carry only reasoning_effort (low/high/max) to control thinking strength, which matches the vendor migration guidance ("off" maps to the lowest tier).
• Fixed both variants, not just flash, since they share the same always-thinking route.

3. Regression coverage and docs

• Added scripts/test-thinking-param.mjs covering the omitted field (OpenAI + Anthropic adapters), the retained reasoning_effort, and the picker no longer exposing "禁用思考" while glm-5.2 keeps it.
• Registered the new script in npm test and synced docs/architecture.md, docs/reference.md and docs/build.md.

Files Changed

File	Change
src/modelOverrides.ts	Added supportsThinkingParam override field and the GLM-5.3 / GLM-5.3-Flash entries.
src/catalogModels.ts	Propagated the capability through ModelMeta and hid the unsupported off switch in the reasoning enum.
src/openai/openaiApi.ts	Omits the thinking field when the route rejects it.
src/anthropic/anthropicApi.ts	Same opt-out for the Anthropic-compatible adapter.
src/provider.ts	Applies the opt-out in both vision-proxy request builders.
src/types.ts	Added supportsThinkingParam to the model config interface.
scripts/test-thinking-param.mjs	New regression test for the omitted field and picker enumeration.
package.json	Registered the new test script in npm test.
docs/architecture.md, docs/reference.md, docs/build.md	Documented the capability, the overrides and the new test script.