fix(docs): fix DCA SDKLinks method names and remove delete_dca page (#1033)

## Summary

Two issues fixed in the DCA documentation (all 3 locales: zh-CN, zh-HK,
en):

1. **SDKLinks method names were wrong** — the `<SDKLinks>` components
referenced non-existent method names, causing broken SDK code links
2. **`delete_dca.md` removed** — the SDK has no `delete` method; the CLI
example on that page already used `dca stop`, so the page was redundant
with `stop_dca.md`

## SDKLinks fixes

| File | Before | After |
|------|--------|-------|
| `list_dca.md` | `method="list_dca"` | `method="list"` |
| `create_dca.md` | `method="create_dca"` | `method="create"` |
| `update_dca.md` | `method="update_dca"` | `method="update"` |
| `dca_history.md` | `method="dca_history"` | `method="history"` |

Already correct (no change): `pause`, `resume`, `stop`, `stats`,
`check_support`, `calc_date`, `set_reminder`

## Removed files (3 locales)

- `docs/{locale}/docs/account/dca/delete_dca.md` — SDK has no `delete`
method; functionality is covered by `stop_dca.md`

## Test plan
- [x] `autocorrect --lint docs/` — no issues ✅
- [x] Local dev server verified (`npm run dev`) ✅

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: hogan-yuan

docs/en/docs/account/dca/create_dca.md

@@ -17,7 +17,7 @@ longbridge dca create AAPL.US --amount 500 --frequency monthly --day-of-month 15
 longbridge dca create TSLA.US --amount 200 --frequency weekly --day-of-week mon
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="create_dca" />
+<SDKLinks module="dca" klass="DCAContext" method="create" />
 
 
 ## Parameters

docs/en/docs/account/dca/dca_history.md

@@ -16,7 +16,7 @@ Get the execution history for a specific DCA plan including trade dates, amounts
 longbridge dca history 1225781523156889600
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="dca_history" />
+<SDKLinks module="dca" klass="DCAContext" method="history" />
 
 
 ## Parameters

docs/en/docs/account/dca/delete_dca.md

@@ -17,7 +17,7 @@ longbridge dca
 longbridge dca --status Active
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="list_dca" />
+<SDKLinks module="dca" klass="DCAContext" method="list" />
 
 
 ## Parameters

docs/en/docs/account/dca/list_dca.md

@@ -17,7 +17,7 @@ longbridge dca pause 1225781523156889600
 longbridge dca resume 1225781523156889600
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="update_dca" />
+<SDKLinks module="dca" klass="DCAContext" method="update" />
 
 
 ## Parameters

docs/en/docs/account/dca/update_dca.md

@@ -17,7 +17,7 @@ longbridge dca create AAPL.US --amount 500 --frequency monthly --day-of-month 15
 longbridge dca create TSLA.US --amount 200 --frequency weekly --day-of-week mon
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="create_dca" />
+<SDKLinks module="dca" klass="DCAContext" method="create" />
 
 
 ## Parameters

docs/zh-CN/docs/account/dca/create_dca.md

@@ -16,7 +16,7 @@ headingLevel: 2
 longbridge dca history 1225781523156889600
 </CliCommand>
 
-<SDKLinks module="dca" klass="DCAContext" method="dca_history" />
+<SDKLinks module="dca" klass="DCAContext" method="history" />
 
 
 ## Parameters