Rename app from chat to neoirc, binary to neoircd (closes #46) (#47)

Complete rename of the application from `chat` to `neoirc` with binary name `neoircd`.

closes #46

## Changes

- **Go module path**: `git.eeqj.de/sneak/chat` → `git.eeqj.de/sneak/neoirc`
- **Server binary**: `chatd` → `neoircd`
- **CLI binary**: `chat-cli` → `neoirc-cli`
- **Cmd directories**: `cmd/chatd` → `cmd/neoircd`, `cmd/chat-cli` → `cmd/neoirc-cli`
- **Go package**: `chatapi` → `neoircapi`
- **Makefile**: binary name, build targets, docker image tag, clean target
- **Dockerfile**: binary paths, user/group names (`chat` → `neoirc`), ENTRYPOINT
- **`.gitignore`/`.dockerignore`**: artifact names
- **All Go imports and doc comments**
- **Default server name**: `chat` → `neoirc`
- **Web client**: localStorage keys (`chat_token`/`chat_channels` → `neoirc_token`/`neoirc_channels`), page title, default server display name
- **Schema files**: all `$id` URLs and example hostnames
- **README.md**: project name, all binary references, examples, directory tree
- **AGENTS.md**: build command reference
- **Test fixtures**: app name and channel names

Docker build passes. All tests pass.

<!-- session: agent:sdlc-manager:subagent:a4b8dbd3-a7c8-4fad-8239-bb5a64a9b3d6 -->

Co-authored-by: clawbot <clawbot@noreply.eeqj.de>
Reviewed-on: #47
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

Dockerfile

@@ -26,20 +26,20 @@ RUN make test
 
 # Build static binaries (no cgo needed at runtime — modernc.org/sqlite is pure Go)
 ARG VERSION=dev
-RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.Version=${VERSION}" -o /chatd ./cmd/chatd/
-RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /chat-cli ./cmd/chat-cli/
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.Version=${VERSION}" -o /neoircd ./cmd/neoircd/
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /neoirc-cli ./cmd/neoirc-cli/
 
 # Runtime stage
 # alpine:3.21, 2026-02-26
 FROM alpine@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709
 RUN apk add --no-cache ca-certificates \
-    && addgroup -S chat && adduser -S chat -G chat \
+    && addgroup -S neoirc && adduser -S neoirc -G neoirc \
     && mkdir -p /var/lib/neoirc \
-    && chown chat:chat /var/lib/neoirc
-COPY --from=builder /chatd /usr/local/bin/chatd
+    && chown neoirc:neoirc /var/lib/neoirc
+COPY --from=builder /neoircd /usr/local/bin/neoircd
 
-USER chat
+USER neoirc
 EXPOSE 8080
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD wget -qO- http://localhost:8080/.well-known/healthcheck.json || exit 1
-ENTRYPOINT ["chatd"]
+ENTRYPOINT ["neoircd"]