fix: respect OPENCODE_CONFIG_DIR environment variable across all config paths

Multiple files were hardcoding ~/.config/opencode paths instead of using
getOpenCodeConfigDir() which respects the OPENCODE_CONFIG_DIR env var.

This broke profile isolation features like OCX ghost mode, where users
set OPENCODE_CONFIG_DIR to a custom path but oh-my-opencode.json and
other configs weren't being read from that location.

Changes:
- plugin-config.ts: Use getOpenCodeConfigDir() directly
- cli/doctor/checks: Use getOpenCodeConfigDir() for auth and config checks
- tools/lsp/config.ts: Use getOpenCodeConfigDir() for LSP config paths
- command loaders: Use getOpenCodeConfigDir() for global command dirs
- hooks: Use getOpenCodeConfigDir() for hook config paths
- config-path.ts: Mark getUserConfigDir() as deprecated
- tests: Ensure OPENCODE_CONFIG_DIR is properly isolated in tests

src/cli/doctor/checks/auth.ts

@@ -1,11 +1,10 @@
 import { existsSync, readFileSync } from "node:fs"
-import { homedir } from "node:os"
 import { join } from "node:path"
 import type { CheckResult, CheckDefinition, AuthProviderInfo, AuthProviderId } from "../types"
 import { CHECK_IDS, CHECK_NAMES } from "../constants"
-import { parseJsonc } from "../../../shared"
+import { parseJsonc, getOpenCodeConfigDir } from "../../../shared"
 
-const OPENCODE_CONFIG_DIR = join(homedir(), ".config", "opencode")
+const OPENCODE_CONFIG_DIR = getOpenCodeConfigDir({ binary: "opencode" })
 const OPENCODE_JSON = join(OPENCODE_CONFIG_DIR, "opencode.json")
 const OPENCODE_JSONC = join(OPENCODE_CONFIG_DIR, "opencode.jsonc")
 

src/cli/doctor/checks/config.ts

@@ -1,12 +1,11 @@
 import { existsSync, readFileSync } from "node:fs"
-import { homedir } from "node:os"
 import { join } from "node:path"
 import type { CheckResult, CheckDefinition, ConfigInfo } from "../types"
 import { CHECK_IDS, CHECK_NAMES, PACKAGE_NAME } from "../constants"
-import { parseJsonc, detectConfigFile } from "../../../shared"
+import { parseJsonc, detectConfigFile, getOpenCodeConfigDir } from "../../../shared"
 import { OhMyOpenCodeConfigSchema } from "../../../config"
 
-const USER_CONFIG_DIR = join(homedir(), ".config", "opencode")
+const USER_CONFIG_DIR = getOpenCodeConfigDir({ binary: "opencode" })
 const USER_CONFIG_BASE = join(USER_CONFIG_DIR, `${PACKAGE_NAME}`)
 const PROJECT_CONFIG_BASE = join(process.cwd(), ".opencode", PACKAGE_NAME)