fix(opencode): doctor ignores global config, lists 0 servers

[Sereinxm]

Problem

getmcp doctor reports OpenCode as installed and "config file is valid", but lists zero servers from it — even when the user has 6+ servers configured in `~/.config/opencode/opencode.jsonc`.

Example output before fix:

```
◆ OpenCode: config file is valid
└ 2 warning(s) found. 9 check(s) passed. ← OpenCode servers missing
```

Root cause

The OpenCode generator declares `globalConfigPaths: null` while its `detectInstalled()` checks for `~/.config/opencode`:

```ts
// packages/generators/src/opencode.ts
configPaths: "opencode.json", // relative path
globalConfigPaths: null, // ← no global path declared
// ...
detectInstalled(): boolean {
return safeExistsSync(join(configHome, "opencode")); // ← but checks global dir
}
```

Because `globalConfigPaths` is `null`:

1. `supportsBothScopes(app)` returns `false` → OpenCode treated as single-scope.
2. `detectApps()` only resolves the relative `opencode.json` (which usually does not exist in CWD).
3. `doctor` reads a non-existent file → `readConfigFile` returns `{}` → `listServersInConfig` returns `[]`.
4. The report shows "config file is valid" (an empty object parses fine) while silently ignoring the user's real global config.

This contradicts the OpenCode docs, which state global settings live in `~/.config/opencode/opencode.jsonc`.

Fix

1. `packages/generators/src/opencode.ts` — declare the real global config paths:

```ts
globalConfigPaths: {
darwin: "/.config/opencode/opencode.jsonc",
win32: "%AppData%/opencode/opencode.jsonc",
linux: "/.config/opencode/opencode.jsonc",
},
```

2. `packages/cli/src/detect.ts` — for dual-scope apps, when the project config doesn't exist but the global one does, point `configPath` at the global file. This makes `doctor` / `list` reflect the config the user is actually using. Also benefits Claude Code users who only keep `~/.claude.json`.

3. `packages/cli/tests/detect.test.ts` — move `opencode` from single-scope to dual-scope assertion list.

Verification

Locally, after the fix:

```
$ getmcp doctor
▲ "exa" is not in the registry and not tracked
│ Configured in: opencode
▲ "semble" is not in the registry and not tracked
│ Configured in: opencode
... (4 more servers now detected)
◆ "codebase-memory-mcp" is configured in 2 apps
└ 7 warning(s) found. 10 check(s) passed.
```

All 6 OpenCode servers are now detected (previously 0).

Testing

• `npx vitest run` → 730 passed, 2 skipped (unchanged)
• `npm run lint` → passes
• `npx oxlint` / `npx oxfmt --check` → clean

Scope of change

```
packages/cli/src/detect.ts | 16 +++++++++++++++-
packages/cli/tests/detect.test.ts | 4 ++--
packages/generators/src/opencode.ts | 12 +++++++++++-
3 files changed, 28 insertions(+), 4 deletions(-)
```

No public API changes. The `detectApps()` fallback to global only triggers when the project file is absent — `add` / `remove` commands, which always resolve scope explicitly, are unaffected.

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