Flatten the repo: move everything out of app/ to the root

Now that the CLI and the Next.js app are one package, nesting it inside
app/ served no purpose - the repo root itself becomes the published
npm package. Merges app/.gitignore and app/README.md into the root
versions, drops the now-duplicate app/LICENSE, and updates path
references (README, docs/ARCHITECTURE.md, docs/CONFIG_REFERENCE.md,
package.json's repository.directory) that assumed the app/ nesting.

Also fixes a real bug this surfaced: the in-app docs viewer resolved
docs/ relative to process.cwd(), which only worked by accident when the
CLI happened to be invoked from app/'s parent directory. A first attempt
at fixing it with import.meta.dirname broke instead, for the same
cross-module-graph reason config-path resolution already documented -
Next compiles Route Handlers through a separate module graph that
doesn't preserve source-relative import.meta paths. Fixed by exposing
the app root via TRIGGERSHELL_APP_ROOT (set once in server.ts, where
import.meta *does* resolve correctly), the same pattern already used
for TRIGGERSHELL_CONFIG_PATH.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/CONFIG_REFERENCE.md

@@ -10,7 +10,7 @@ present) into its environment - without overriding any variable already set in t
 secrets referenced via `${VAR}` don't have to be committed alongside the config. `triggershell
 init` scaffolds both files together.
 
-The canonical schema is the Zod schema at `app/src/lib/config/schema.ts` — this document mirrors
+The canonical schema is the Zod schema at `src/lib/config/schema.ts` — this document mirrors
 it. `triggershell validate` loads and validates the config directly against the schema below (no
 separate pre-flight step).