docs: restore the missing docs/ targets and split the catalog-seeding wording (#1811) (#1812)

Closes #1811

Four README links pointed at files that don't exist on `v2/main`, and the launcher README described catalog seeding as one behavior when it is two.

- `docs/mcp-server-configuration.md` — written fresh for v2 (the v1.5 file predates the `--catalog`/`--config` split)
- `docs/launcher-config-consolidation-plan.md` — restored from `v1.5/main`, path drift corrected, v2 notes appended
- `docs/images/tui-screenshot.png` — regenerated against the current TUI
- launcher README seeding wording — split into the two real behaviors (web seeds two sample servers; cli/tui seed empty)

Review across three rounds also corrected several claims verified against source: the `--` separator is inverted between web and cli, a cli target placed after a flag is silently discarded, `--server` is a no-op on web and an unknown-option error on tui, the `MCP_CATALOG_PATH` ad-hoc guard is cli-only, and the conflict matrix diverges on both `--header` and `--transport stdio`.

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https://claude.ai/code/session_01Txmv2qqv3yeKgRzoqXytzD

README.md

@@ -45,7 +45,11 @@ inspector/
 Each client has its own README with client-specific detail:
 [web](./clients/web/README.md) · [cli](./clients/cli/README.md) · [tui](./clients/tui/README.md) · [launcher](./clients/launcher/README.md).
 
-Task-oriented guides live under [`docs/`](./docs) — see [Reviewing an MCP App](./docs/mcp-app-review.md), the CLI-first → one-shot-web recipe for automated App-tool review: `--app-info` probe → deep-link navigate → rendered widget, plus OAuth handoff and proxy support.
+Task-oriented guides live under [`docs/`](./docs):
+
+- [MCP server configuration](./docs/mcp-server-configuration.md) — which server(s) the Inspector connects to: `--catalog` vs. `--config`, ad-hoc targets, the `--` separator, the file format and its Inspector-specific per-server fields. Shared by all three clients; the cli and tui READMEs delegate their server-options sections to it.
+- [Reviewing an MCP App](./docs/mcp-app-review.md) — the CLI-first → one-shot-web recipe for automated App-tool review: `--app-info` probe → deep-link navigate → rendered widget, plus OAuth handoff and proxy support.
+- [Launcher and config consolidation](./docs/launcher-config-consolidation-plan.md) — why the launcher runs a client in-process rather than spawning it, and how the shared config processor fits in.
 
 ## Setup