docs: move model catalog out of shared

The model catalog is no longer a frontend/backend runtime contract.

Keeping it under shared made ownership misleading. It implied the catalog was
application code shared by runtime consumers, even though it now only supports
README links and public API documentation.

Move the catalog into public so it lives beside the docs surfaces that need it.
This gives the API docs a stable, served module and gives README readers a
linkable source without suggesting frontend or backend runtime dependency.

Render the API docs model list from the exported provider registry instead of a
hardcoded Claude/Cursor/Codex subset. That keeps Gemini and OpenCode visible and
makes future provider documentation changes flow through one docs-specific file.

Update README links, provider maintenance notes, and package files so published
artifacts include the standalone docs page and model catalog without relying on
the old shared path.

shared/modelConstants.js

@@ -1,129 +0,0 @@
-/**
- * Centralized Model Definitions
- * Single source of truth for all supported AI models
- */
-
-/**
- * Claude (Anthropic) Models
- *
- * Note: Claude uses two different formats:
- * - SDK format ('sonnet', 'opus') - used by the UI and claude-sdk.js
- * - API format ('claude-sonnet-4.5') - used by slash commands for display
- */
-export const CLAUDE_MODELS = {
-  // Models in SDK format (what the actual SDK accepts)
-  OPTIONS: [
-    { value: "opus", label: "Opus" },
-    { value: "sonnet", label: "Sonnet" },
-    { value: "haiku", label: "Haiku" },
-    { value: "claude-opus-4-6", label: "Opus 4.6" },
-    { value: "opusplan", label: "Opus Plan" },
-    { value: "sonnet[1m]", label: "Sonnet [1M]" },
-    { value: "opus[1m]", label: "Opus [1M]" },
-  ],
-
-  DEFAULT: "opus",
-};
-
-/**
- * Cursor Models
- */
-export const CURSOR_MODELS = {
-  OPTIONS: [
-    { value: "opus-4.6-thinking", label: "Claude 4.6 Opus (Thinking)" },
-    { value: "gpt-5.3-codex", label: "GPT-5.3" },
-    { value: "gpt-5.2-high", label: "GPT-5.2 High" },
-    { value: "gemini-3-pro", label: "Gemini 3 Pro" },
-    { value: "opus-4.5-thinking", label: "Claude 4.5 Opus (Thinking)" },
-    { value: "gpt-5.2", label: "GPT-5.2" },
-    { value: "gpt-5.1", label: "GPT-5.1" },
-    { value: "gpt-5.1-high", label: "GPT-5.1 High" },
-    { value: "composer-1", label: "Composer 1" },
-    { value: "auto", label: "Auto" },
-    { value: "sonnet-4.5", label: "Claude 4.5 Sonnet" },
-    { value: "sonnet-4.5-thinking", label: "Claude 4.5 Sonnet (Thinking)" },
-    { value: "opus-4.5", label: "Claude 4.5 Opus" },
-    { value: "gpt-5.1-codex", label: "GPT-5.1 Codex" },
-    { value: "gpt-5.1-codex-high", label: "GPT-5.1 Codex High" },
-    { value: "gpt-5.1-codex-max", label: "GPT-5.1 Codex Max" },
-    { value: "gpt-5.1-codex-max-high", label: "GPT-5.1 Codex Max High" },
-    { value: "opus-4.1", label: "Claude 4.1 Opus" },
-    { value: "grok", label: "Grok" },
-  ],
-
-  DEFAULT: "gpt-5.3-codex",
-};
-
-/**
- * Codex (OpenAI) Models
- */
-export const CODEX_MODELS = {
-  OPTIONS: [
-    { value: "gpt-5.5", label: "GPT-5.5" },
-    { value: "gpt-5.4", label: "GPT-5.4" },
-    { value: "gpt-5.4-mini", label: "GPT-5.4 mini" },
-    { value: "gpt-5.3-codex", label: "GPT-5.3 Codex" },
-    { value: "gpt-5.2-codex", label: "GPT-5.2 Codex" },
-    { value: "gpt-5.2", label: "GPT-5.2" },
-    { value: "gpt-5.1-codex-max", label: "GPT-5.1 Codex Max" },
-    { value: "o3", label: "O3" },
-    { value: "o4-mini", label: "O4-mini" },
-  ],
-
-  DEFAULT: "gpt-5.4",
-};
-
-/**
- * Gemini Models
- */
-export const GEMINI_MODELS = {
-  OPTIONS: [
-    { value: "gemini-3.1-pro-preview", label: "Gemini 3.1 Pro Preview" },
-    { value: "gemini-3-pro-preview", label: "Gemini 3 Pro Preview" },
-    { value: "gemini-3-flash-preview", label: "Gemini 3 Flash Preview" },
-    { value: "gemini-2.5-flash", label: "Gemini 2.5 Flash" },
-    { value: "gemini-2.5-pro", label: "Gemini 2.5 Pro" },
-    { value: "gemini-2.0-flash-lite", label: "Gemini 2.0 Flash Lite" },
-    { value: "gemini-2.5-flash-lite", label: "Gemini 2.5 Flash Lite" },
-    { value: "gemini-2.0-flash", label: "Gemini 2.0 Flash" },
-    { value: "gemini-2.0-pro-exp", label: "Gemini 2.0 Pro Experimental" },
-    {
-      value: "gemini-2.0-flash-thinking-exp",
-      label: "Gemini 2.0 Flash Thinking",
-    },
-  ],
-
-  DEFAULT: "gemini-3.1-pro-preview",
-};
-
-/**
- * OpenCode Models
- *
- * OpenCode model ids include the upstream provider prefix. Users can still type
- * any OpenCode-supported model in the selector when their config enables it.
- */
-export const OPENCODE_MODELS = {
-  OPTIONS: [
-    { value: "anthropic/claude-sonnet-4-5", label: "Claude Sonnet 4.5" },
-    { value: "anthropic/claude-opus-4-1", label: "Claude Opus 4.1" },
-    { value: "anthropic/claude-haiku-4-5", label: "Claude Haiku 4.5"},
-    { value: "openai/gpt-5.1", label: "GPT-5.1" },
-    { value: "openai/gpt-5.1-codex", label: "GPT-5.1 Codex" },
-    { value: "openai/gpt-5.4-mini", label: "GPT-5.4 Mini" },
-    { value: "google/gemini-2.5-pro", label: "Gemini 2.5 Pro" },
-    { value: "google/gemini-2.5-flash", label: "Gemini 2.5 Flash" },
-  ],
-
-  DEFAULT: "anthropic/claude-sonnet-4-5",
-};
-
-/**
- * Ordered provider registry. Display order in selection UIs.
- */
-export const PROVIDERS = [
-  { id: "claude", name: "Anthropic", models: CLAUDE_MODELS },
-  { id: "codex", name: "OpenAI", models: CODEX_MODELS },
-  { id: "gemini", name: "Google", models: GEMINI_MODELS },
-  { id: "cursor", name: "Cursor", models: CURSOR_MODELS },
-  { id: "opencode", name: "OpenCode", models: OPENCODE_MODELS },
-];