Parsing: make parse syntax a per-parse value, drop ModeInterface

The active parse's syntax flavour is a per-parse question, not process-
global state: within a single request a plugin can render bun

Parsing: make parse syntax a per-parse value, drop ModeInterface

The active parse's syntax flavour is a per-parse question, not process-
global state: within a single request a plugin can render bundled
DokuWiki-syntax text inside an otherwise-Markdown page. Yet ModeRegistry
was a singleton that read $conf['syntax'] and the $PARSER_MODES global,
and every mode reached it through ModeRegistry::getInstance() — so the
flavour lived in shared mutable state that two parses in one request
would fight over.

Make the registry a short-lived value instead:

- ModeRegistry is constructed once per parse with an explicit $syntax
and injected into Parser, Handler and every mode. getSyntax() /
isDwPreferred() / isMdPreferred() consult $this->syntax; the
DOKU_UNITTEST-gated mode-list cache hack is gone (each registry is
fresh, nothing to invalidate).
- p_get_instructions() is now the single place in the pipeline where
$conf['syntax'] is read; from there the flavour travels as a
parameter. No code under inc/Parsing/ reads $conf['syntax'] directly
anymore — the five syntax-reading modes (Preformatted, GfmHr,
GfmEscape, Externallink, GfmQuote) route through $this->registry.

Keep the two concepts apart, as documented in the ModeRegistry and
AbstractMode docblocks: the user's configured *preference* stays in
$conf['syntax'] for UI code (toolbar, settings), while the active
parse's syntax is a parameter carried by the registry.

$PARSER_MODES is demoted to a deprecated, read-only mirror, published
during loadPluginModes() — third-party syntax plugins (columnlist,
alphalist2, phpwikify, skipentity) and the bundled info plugin read the
global directly, often from their constructors, so the taxonomy must
stay visible there. No core code reads the mirror.

Fold ModeInterface into AbstractMode while here: getSort()/handle() are
abstract, the connect callbacks carry defaults, and the public $Lexer
"FIXME should be done by setter" becomes setLexer()/getLexer() injected
by Parser::addMode() alongside the registry. Nested-content resolution
moves to the allowedCategories()/filterAllowedModes() hooks, resolved
once when the registry is attached.

Tests build their own parser/registry through ParserTestBase::setSyntax()
instead of mutating $conf and calling the removed ModeRegistry::reset().

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GfmLink: allow soft line break inside link text

The label character class explicitly forbade `\n`, so a CommonMark
soft line break inside link text (e.g. `[link with<EOL>more](url)`)
fell through to

GfmLink: allow soft line break inside link text

The label character class explicitly forbade `\n`, so a CommonMark
soft line break inside link text (e.g. `[link with<EOL>more](url)`)
fell through to literal text instead of producing a link. Loosen the
class to accept a bare `\n` as long as it is not followed by a blank
line — soft breaks are spec-allowed inside link text, blank lines are
not, and refusing them also keeps `\n#`-anchored block modes (header,
hr, ...) from being swallowed by a runaway link match.

The `\n` survives into the label string and renders as a literal line
ending in HTML, which browsers display as a single space. This soft
break behavior has been checked against
https://spec.commonmark.org/dingus/

Note that this behavior differs from github where the line break is
rendered as a hard break <br>.

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GfmLink: accept escaped brackets inside link labels

The label slot used `[^\[\]\n]+`, which rejected `\[` / `\]` and
left labels with escaped brackets unmatched. Promote it to
`(?:\\.|[^\[\]\n])+` —

GfmLink: accept escaped brackets inside link labels

The label slot used `[^\[\]\n]+`, which rejected `\[` / `\]` and
left labels with escaped brackets unmatched. Promote it to
`(?:\\.|[^\[\]\n])+` — the same backslash-escape trick the URL
slot already uses — so spec example 523 (`[link \[bar](/uri)`)
matches and unescapes cleanly. The image-as-label sub-pattern
gets the same upgrade.

handle() needs no change: the new class still rejects bare `]`,
so the first literal `](` in the match is still the separator;
Escape::unescapeBackslashes() was already collapsing `\[` to `[`
before the label reached the link handler.

Adds two GfmLinkTest cases for the `\[` / `\]` forms.

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rename syntax flavors 'dokuwiki' / 'markdown' to 'dw' / 'md'

Symmetry with the existing 'dw+md' / 'md+dw' setting values.

add GfmEscape for GFM backslash escapes

Implements GFM §6.1 backslash-escape handling. GfmEscape is a sort-5
inline mode in CATEGORY_SUBSTITION that claims `\X` for any escapable
ASCII punctuation c

add GfmEscape for GFM backslash escapes

Implements GFM §6.1 backslash-escape handling. GfmEscape is a sort-5
inline mode in CATEGORY_SUBSTITION that claims `\X` for any escapable
ASCII punctuation char before competing delimiters can match. The
shared character class lives on Helpers\Escape so the lexer pattern
and the post-hoc unescape stay in lockstep.

Whole-span captures (GfmCode info string, GfmLink label/URL) bypass
the lexer; those modes call Escape::unescapeBackslashes() on the
relevant slot. GfmLink skips the unescape when the URL classifies as
a windowssharelink so the leading \\host survives intact.

GfmTable cells get a separate per-cell `\|` to `|` pass in the
rewriter to honour the tables-extension rule that pipes always
unescape, even inside code spans where standard §6.1 escapes don't
fire.

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add GfmMedia and extend GfmLink with image-as-label form

- New GfmMedia parses `` with the full DokuWiki media-parameter
vocabulary in the URL slot (?100x200, ?right, ?nolink, ?recache,

add GfmMedia and extend GfmLink with image-as-label form

- New GfmMedia parses `` with the full DokuWiki media-parameter
vocabulary in the URL slot (?100x200, ?right, ?nolink, ?recache, …).
Adds `?left`/`?right`/`?center` align keywords shared with DW `{{…}}`
— gives pure-Markdown users a way to align inline images.
- GfmLink now also matches `[](target)` — the GFM equivalent
of `[[target|{{img}}]]`. Detection is post-entry, mirroring
Internallink's `^{{…}}$` check; one mode covers the whole family.
- LinkDispatch trait replaced by Helpers::classifyLink and
Helpers::parseMediaParameters — two pure static methods, shared by
DW and GFM counterparts.
- Entry patterns for GfmLink / GfmMedia simplified (permissive URL slot,
handle-time parsing), following DW's Internallink style.
- GfmSpecTest drives a test-only SpecCompatRenderer that emits bare
<img> / <a> instead of DW's wiki-wrapped HTML, recovering 13 spec
tests that previously failed/skipped only because of renderer shape.

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add GfmLink for GFM inline links `[text](url)`

Extracts the URL-classification ladder from Internallink into a
LinkDispatch trait so both modes route identically across all six
DokuWiki link flavors

add GfmLink for GFM inline links `[text](url)`

Extracts the URL-classification ladder from Internallink into a
LinkDispatch trait so both modes route identically across all six
DokuWiki link flavors (internal, external, interwiki, email,
windowsshare, local anchor). GfmLink parses the `[text](url)` form
with optional `"title"` / `'title'` and hands the URL to the trait.
The GFM title attribute is discarded — DokuWiki link instructions
have no slot for it.

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