Rewrite store JSDoc, split quote/order into modules, and generate typed API docs

- Rewrite JSDoc across all store methods to document the actual async
  methods (real params, returns, throws) instead of the internal wrappers
- Split quote/order into individual module files backed by shared
  manifestDoc helpers; remove the createStore factory and thin wrappers
- Deduplicate manifest line helpers into src/store/manifestLines.js
- Extend generate-api-doc.js to render parameter/return/throws types and
  emit per-namespace API.<module>.md files with an API.md index
- Regenerate all API docs

API.lang.md

@@ -8,6 +8,19 @@ This document is auto-generated from the JSDoc comments in `src/store` by runnin
 
 Creates a new language by its ISO 639 code.
 
+**Parameters**
+
+| Name | Type | Description |
+| --- | --- | --- |
+| `iso639` | `string` | The ISO 639 language code (e.g. `'de'`). |
+| `[tx]` | `object` | Optional transaction to run within. |
+
+**Returns**
+
+`Promise<number>` — The id of the created language.
+
+**Example**
+
 ```js
 const id = await store.lang.create('de');
 // => 1
@@ -19,6 +32,18 @@ const id = await store.lang.create('de');
 
 Deletes a language by its id.
 
+**Parameters**
+
+| Name | Type | Description |
+| --- | --- | --- |
+| `id` | `number` | The id of the language to delete. |
+
+**Returns**
+
+`Promise<void>`
+
+**Example**
+
 ```js
 await store.lang.delete(1);
 ```
@@ -29,6 +54,19 @@ await store.lang.delete(1);
 
 Returns the id of a language by ISO code, creating it if it does not exist.
 
+**Parameters**
+
+| Name | Type | Description |
+| --- | --- | --- |
+| `iso639` | `string` | The ISO 639 language code (e.g. `'de'`). |
+| `[tx]` | `object` | Optional transaction to run within. |
+
+**Returns**
+
+`Promise<number>` — The id of the language.
+
+**Example**
+
 ```js
 const id = await store.lang.ensure('de');
 // => 1
@@ -40,6 +78,19 @@ const id = await store.lang.ensure('de');
 
 Returns a language row by its ISO 639 code.
 
+**Parameters**
+
+| Name | Type | Description |
+| --- | --- | --- |
+| `iso639` | `string` | The ISO 639 language code (e.g. `'de'`). |
+| `[tx]` | `object` | Optional transaction to run within. |
+
+**Returns**
+
+`Promise<{id: number, iso639: string}>` — The language row, or `undefined` if not found.
+
+**Example**
+
 ```js
 const lang = await store.lang.getByIso639('de');
 // => { id: 1, iso639: 'de' }
@@ -51,6 +102,12 @@ const lang = await store.lang.getByIso639('de');
 
 Lists all languages.
 
+**Returns**
+
+`Promise<Array<{id: number, iso639: string}>>` — All language rows.
+
+**Example**
+
 ```js
 const languages = await store.lang.list();
 // => [{ id: 1, iso639: 'de' }]